[llvm] [AMDGPU] Optimize block count calculations to the new ABI (PR #174112)

[Matt Arsenault via llvm-commits]

================
@@ -322,6 +325,48 @@ static bool processUse(CallInst *CI, bool IsV5OrAbove) {
     }
   }
 
+  // Upgrade the old method of calculating the block size using the grid size.
+  // We pattern match any case where the implicit argument group size is the
+  // divisor to a dispatch packet grid size read of the same dimension.
+  if (IsV5OrAbove && llvm::any_of(GroupSizes, [](Value *V) { return V; })) {
----------------
arsenm wrote:

Don't understand this lambda. is this just is_contained? 

https://github.com/llvm/llvm-project/pull/174112