Remove LINQ calls in hot paths

osu.Game/Skinning/SkinnableSound.cs

@@ -194,9 +194,33 @@ private void updateSamples()
         /// <summary>
         /// Whether any samples are currently playing.
         /// </summary>
-        public bool IsPlaying => samplesContainer.Any(s => s.Playing);
+        public bool IsPlaying
+        {
+            get
+            {
+                foreach (PoolableSkinnableSample s in samplesContainer)
+                {
+                    if (s.Playing)
+                        return true;
+                }
+
+                return false;
+            }
+        }
 
-        public bool IsPlayed => samplesContainer.Any(s => s.Played);
+        public bool IsPlayed
+        {
+            get
+            {
+                foreach (PoolableSkinnableSample s in samplesContainer)
+                {
+                    if (s.Played)
+                        return true;
+                }
+
+                return false;
+            }
+        }
 
         public IBindable<double> AggregateVolume => samplesContainer.AggregateVolume;