JIT: Fix ACD updates when a non-enclosing EH region is removed

When an EH region is removed, the JIT must make suitable updates to
any existing AddCodeDescs (ACDs). We were missing logic for the case
where the removed region was not the enclosing region of the ACD.

Fixes dotnet#110346.

We still need to adjust the try/handler index

src/coreclr/jit/fgehopt.cpp

@@ -297,18 +297,15 @@ void Compiler::fgUpdateACDsBeforeEHTableEntryRemoval(unsigned XTnum)
         //
         AddCodeDscKey oldKey(add);
 
-        const bool inHnd = add->acdHndIndex > 0;
-        const bool inTry = add->acdTryIndex > 0;
-        const bool inThisHnd =
-            inHnd && ((unsigned)(add->acdHndIndex - 1) == XTnum) && (add->acdKeyDsg == AcdKeyDesignator::KD_HND);
-        const bool inThisFlt =
-            inHnd && ((unsigned)(add->acdHndIndex - 1) == XTnum) && (add->acdKeyDsg == AcdKeyDesignator::KD_FLT);
-        const bool inThisTry =
-            inTry && ((unsigned)(add->acdTryIndex - 1) == XTnum) && (add->acdKeyDsg == AcdKeyDesignator::KD_TRY);
+        const bool inHnd     = add->acdHndIndex > 0;
+        const bool inTry     = add->acdTryIndex > 0;
+        const bool inThisHnd = inHnd && ((unsigned)(add->acdHndIndex - 1) == XTnum);
+        const bool inThisFlt = inHnd && ((unsigned)(add->acdHndIndex - 1) == XTnum);
+        const bool inThisTry = inTry && ((unsigned)(add->acdTryIndex - 1) == XTnum);
 
         // If this ACD is in the filter of this region, it is no longer needed
         //
-        if (inThisFlt)
+        if (inThisFlt && (add->acdKeyDsg == AcdKeyDesignator::KD_FLT))
         {
             bool const removed = map->Remove(oldKey);
             assert(removed);
@@ -326,6 +323,8 @@ void Compiler::fgUpdateACDsBeforeEHTableEntryRemoval(unsigned XTnum)
             continue;
         }
 
+        bool rekey = false;
+
         // If this ACD is in the handler of this region, update the
         // enclosing handler index.
         //
@@ -339,6 +338,8 @@ void Compiler::fgUpdateACDsBeforeEHTableEntryRemoval(unsigned XTnum)
             {
                 add->acdHndIndex = ebd->ebdEnclosingHndIndex + 1;
             }
+
+            rekey = (add->acdKeyDsg == AcdKeyDesignator::KD_HND);
         }
 
         // If this ACD is in the try of this region, update the
@@ -354,6 +355,17 @@ void Compiler::fgUpdateACDsBeforeEHTableEntryRemoval(unsigned XTnum)
             {
                 add->acdTryIndex = ebd->ebdEnclosingTryIndex + 1;
             }
+            rekey = (add->acdKeyDsg == AcdKeyDesignator::KD_TRY);
+        }
+
+        if (!rekey)
+        {
+            // If we didn't change the enclosing region for the ACD,
+            // the modifications above didn't change the key.
+            //
+            JITDUMP("ACD%u non-enclosing region updated; key remains the same\n", add->acdNum);
+            JITDUMPEXEC(add->Dump());
+            continue;
         }
 
         // Update the ACD key designator (note it may change).
@@ -388,7 +400,7 @@ void Compiler::fgUpdateACDsBeforeEHTableEntryRemoval(unsigned XTnum)
         {
             // If not, re-enter this ACD in the map with the updated key
             //
-            JITDUMP("ACD%u updated\n", add->acdNum);
+            JITDUMP("ACD%u updated with new key\n", add->acdNum);
             map->Set(newKey, add);
             JITDUMPEXEC(add->Dump());
         }