diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index d818a0261c1a..d6f549901947 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -1,16 +1,16 @@
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.NETCore.Runtime.CoreCLR" Version="5.0.0-alpha1.19525.1">
+    <Dependency Name="Microsoft.NETCore.Runtime.CoreCLR" Version="5.0.0-alpha1.19551.3">
       <Uri>https://github.com/dotnet/coreclr</Uri>
-      <Sha>cea2bba3c295c5280d01900f7ae5492951ad8995</Sha>
+      <Sha>e4863f47ec226fb1dd0b20cf953944237c87883c</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NETCore.ILAsm" Version="5.0.0-alpha1.19525.1">
+    <Dependency Name="Microsoft.NETCore.ILAsm" Version="5.0.0-alpha1.19551.3">
       <Uri>https://github.com/dotnet/coreclr</Uri>
-      <Sha>cea2bba3c295c5280d01900f7ae5492951ad8995</Sha>
+      <Sha>e4863f47ec226fb1dd0b20cf953944237c87883c</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.Sdk.IL" Version="5.0.0-alpha1.19525.1">
+    <Dependency Name="Microsoft.NET.Sdk.IL" Version="5.0.0-alpha1.19551.3">
       <Uri>https://github.com/dotnet/coreclr</Uri>
-      <Sha>cea2bba3c295c5280d01900f7ae5492951ad8995</Sha>
+      <Sha>e4863f47ec226fb1dd0b20cf953944237c87883c</Sha>
     </Dependency>
     <Dependency Name="ILLink.Tasks" Version="0.1.6-prerelease.19523.1">
       <Uri>https://github.com/mono/linker</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index e99838993739..f4beef86de97 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -44,9 +44,9 @@
     <MicrosoftNETCoreDotNetHostVersion>5.0.0-alpha.1.19551.1</MicrosoftNETCoreDotNetHostVersion>
     <MicrosoftNETCoreDotNetHostPolicyVersion>5.0.0-alpha.1.19551.1</MicrosoftNETCoreDotNetHostPolicyVersion>
     <!-- Coreclr dependencies -->
-    <MicrosoftNETCoreILAsmVersion>5.0.0-alpha1.19525.1</MicrosoftNETCoreILAsmVersion>
-    <MicrosoftNETCoreRuntimeCoreCLRVersion>5.0.0-alpha1.19525.1</MicrosoftNETCoreRuntimeCoreCLRVersion>
-    <MicrosoftNETSdkILVersion>5.0.0-alpha1.19525.1</MicrosoftNETSdkILVersion>
+    <MicrosoftNETCoreILAsmVersion>5.0.0-alpha1.19551.3</MicrosoftNETCoreILAsmVersion>
+    <MicrosoftNETCoreRuntimeCoreCLRVersion>5.0.0-alpha1.19551.3</MicrosoftNETCoreRuntimeCoreCLRVersion>
+    <MicrosoftNETSdkILVersion>5.0.0-alpha1.19551.3</MicrosoftNETSdkILVersion>
     <!-- Corefx dependencies -->
     <MicrosoftNETCorePlatformsVersion>5.0.0-alpha.1.19551.1</MicrosoftNETCorePlatformsVersion>
     <runtimenativeSystemIOPortsVersion>5.0.0-alpha.1.19551.1</runtimenativeSystemIOPortsVersion>
diff --git a/global.json b/global.json
index 7486bb3a73c0..ec94d6d168d9 100644
--- a/global.json
+++ b/global.json
@@ -13,6 +13,6 @@
     "Microsoft.DotNet.Build.Tasks.Configuration": "5.0.0-beta.19551.2",
     "Microsoft.DotNet.CoreFxTesting": "5.0.0-beta.19551.2",
     "FIX-85B6-MERGE-9C38-CONFLICT": "1.0.0",
-    "Microsoft.NET.Sdk.IL": "5.0.0-alpha1.19525.1"
+    "Microsoft.NET.Sdk.IL": "5.0.0-alpha1.19551.3"
   }
 }
diff --git a/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs b/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs
index 79ff28111d55..2578bec0fac3 100644
--- a/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs
+++ b/src/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.cs
@@ -72,18 +72,29 @@ internal AdvSimd() { }
         public static System.Runtime.Intrinsics.Vector64<float> AndNot(System.Runtime.Intrinsics.Vector64<float> left, System.Runtime.Intrinsics.Vector64<float> right) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<ushort> AndNot(System.Runtime.Intrinsics.Vector64<ushort> left, System.Runtime.Intrinsics.Vector64<ushort> right) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<uint> AndNot(System.Runtime.Intrinsics.Vector64<uint> left, System.Runtime.Intrinsics.Vector64<uint> right) { throw null; }
-        public static System.Runtime.Intrinsics.Vector128<byte> LeadingSignCount(System.Runtime.Intrinsics.Vector128<byte> value) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<byte> BitwiseSelect(System.Runtime.Intrinsics.Vector128<byte> select, System.Runtime.Intrinsics.Vector128<byte> left, System.Runtime.Intrinsics.Vector128<byte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<double> BitwiseSelect(System.Runtime.Intrinsics.Vector128<double> select, System.Runtime.Intrinsics.Vector128<double> left, System.Runtime.Intrinsics.Vector128<double> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<short> BitwiseSelect(System.Runtime.Intrinsics.Vector128<short> select, System.Runtime.Intrinsics.Vector128<short> left, System.Runtime.Intrinsics.Vector128<short> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<int> BitwiseSelect(System.Runtime.Intrinsics.Vector128<int> select, System.Runtime.Intrinsics.Vector128<int> left, System.Runtime.Intrinsics.Vector128<int> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<long> BitwiseSelect(System.Runtime.Intrinsics.Vector128<long> select, System.Runtime.Intrinsics.Vector128<long> left, System.Runtime.Intrinsics.Vector128<long> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<sbyte> BitwiseSelect(System.Runtime.Intrinsics.Vector128<sbyte> select, System.Runtime.Intrinsics.Vector128<sbyte> left, System.Runtime.Intrinsics.Vector128<sbyte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<float> BitwiseSelect(System.Runtime.Intrinsics.Vector128<float> select, System.Runtime.Intrinsics.Vector128<float> left, System.Runtime.Intrinsics.Vector128<float> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<ushort> BitwiseSelect(System.Runtime.Intrinsics.Vector128<ushort> select, System.Runtime.Intrinsics.Vector128<ushort> left, System.Runtime.Intrinsics.Vector128<ushort> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<uint> BitwiseSelect(System.Runtime.Intrinsics.Vector128<uint> select, System.Runtime.Intrinsics.Vector128<uint> left, System.Runtime.Intrinsics.Vector128<uint> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector128<ulong> BitwiseSelect(System.Runtime.Intrinsics.Vector128<ulong> select, System.Runtime.Intrinsics.Vector128<ulong> left, System.Runtime.Intrinsics.Vector128<ulong> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<byte> BitwiseSelect(System.Runtime.Intrinsics.Vector64<byte> select, System.Runtime.Intrinsics.Vector64<byte> left, System.Runtime.Intrinsics.Vector64<byte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<short> BitwiseSelect(System.Runtime.Intrinsics.Vector64<short> select, System.Runtime.Intrinsics.Vector64<short> left, System.Runtime.Intrinsics.Vector64<short> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<int> BitwiseSelect(System.Runtime.Intrinsics.Vector64<int> select, System.Runtime.Intrinsics.Vector64<int> left, System.Runtime.Intrinsics.Vector64<int> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<sbyte> BitwiseSelect(System.Runtime.Intrinsics.Vector64<sbyte> select, System.Runtime.Intrinsics.Vector64<sbyte> left, System.Runtime.Intrinsics.Vector64<sbyte> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<float> BitwiseSelect(System.Runtime.Intrinsics.Vector64<float> select, System.Runtime.Intrinsics.Vector64<float> left, System.Runtime.Intrinsics.Vector64<float> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<ushort> BitwiseSelect(System.Runtime.Intrinsics.Vector64<ushort> select, System.Runtime.Intrinsics.Vector64<ushort> left, System.Runtime.Intrinsics.Vector64<ushort> right) { throw null; }
+        public static System.Runtime.Intrinsics.Vector64<uint> BitwiseSelect(System.Runtime.Intrinsics.Vector64<uint> select, System.Runtime.Intrinsics.Vector64<uint> left, System.Runtime.Intrinsics.Vector64<uint> right) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<short> LeadingSignCount(System.Runtime.Intrinsics.Vector128<short> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<int> LeadingSignCount(System.Runtime.Intrinsics.Vector128<int> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<sbyte> LeadingSignCount(System.Runtime.Intrinsics.Vector128<sbyte> value) { throw null; }
-        public static System.Runtime.Intrinsics.Vector128<ushort> LeadingSignCount(System.Runtime.Intrinsics.Vector128<ushort> value) { throw null; }
-        public static System.Runtime.Intrinsics.Vector128<uint> LeadingSignCount(System.Runtime.Intrinsics.Vector128<uint> value) { throw null; }
-        public static System.Runtime.Intrinsics.Vector64<byte> LeadingSignCount(System.Runtime.Intrinsics.Vector64<byte> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<short> LeadingSignCount(System.Runtime.Intrinsics.Vector64<short> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<int> LeadingSignCount(System.Runtime.Intrinsics.Vector64<int> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector64<sbyte> LeadingSignCount(System.Runtime.Intrinsics.Vector64<sbyte> value) { throw null; }
-        public static System.Runtime.Intrinsics.Vector64<ushort> LeadingSignCount(System.Runtime.Intrinsics.Vector64<ushort> value) { throw null; }
-        public static System.Runtime.Intrinsics.Vector64<uint> LeadingSignCount(System.Runtime.Intrinsics.Vector64<uint> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<byte> LeadingZeroCount(System.Runtime.Intrinsics.Vector128<byte> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<short> LeadingZeroCount(System.Runtime.Intrinsics.Vector128<short> value) { throw null; }
         public static System.Runtime.Intrinsics.Vector128<int> LeadingZeroCount(System.Runtime.Intrinsics.Vector128<int> value) { throw null; }
@@ -235,13 +246,30 @@ internal Arm64() { }
             public static bool IsSupported { get { throw null; } }
             public static int LeadingSignCount(int value) { throw null; }
             public static int LeadingSignCount(long value) { throw null; }
-            public static int LeadingSignCount(uint value) { throw null; }
-            public static int LeadingSignCount(ulong value) { throw null; }
             public static int LeadingZeroCount(long value) { throw null; }
             public static int LeadingZeroCount(ulong value) { throw null; }
         }
     }
     [System.CLSCompliantAttribute(false)]
+    public abstract partial class Crc32 : System.Runtime.Intrinsics.Arm.ArmBase
+    {
+        internal Crc32() { }
+        public static new bool IsSupported { get { throw null; } }
+        public static uint ComputeCrc32(uint crc, byte data) { throw null; }
+        public static uint ComputeCrc32(uint crc, ushort data) { throw null; }
+        public static uint ComputeCrc32(uint crc, uint data) { throw null; }
+        public static uint ComputeCrc32C(uint crc, byte data) { throw null; }
+        public static uint ComputeCrc32C(uint crc, ushort data) { throw null; }
+        public static uint ComputeCrc32C(uint crc, uint data) { throw null; }
+        public new abstract partial class Arm64 : System.Runtime.Intrinsics.Arm.ArmBase.Arm64
+        {
+            internal Arm64() { }
+            public static new bool IsSupported { get { throw null; } }
+            public static uint ComputeCrc32(uint crc, ulong data) { throw null; }
+            public static uint ComputeCrc32C(uint crc, ulong data) { throw null; }
+        }
+    }
+    [System.CLSCompliantAttribute(false)]
     public abstract partial class Sha1 : System.Runtime.Intrinsics.Arm.ArmBase
     {
         internal Sha1() { }