[clang] [llvm] [AMDGPU] Enable atomic optimizer for 64 bit divergent values (PR #96473)

[Matt Arsenault via cfe-commits]

================
@@ -178,6 +178,20 @@ bool AMDGPUAtomicOptimizerImpl::run(Function &F) {
   return Changed;
 }
 
+static bool shouldOptimize(Type *Ty) {
+  switch (Ty->getTypeID()) {
+  case Type::FloatTyID:
+  case Type::DoubleTyID:
+    return true;
+  case Type::IntegerTyID: {
+    if (Ty->getIntegerBitWidth() == 32 || Ty->getIntegerBitWidth() == 64)
+      return true;
+  }
----------------
arsenm wrote:

Don't forget pointers 

https://github.com/llvm/llvm-project/pull/96473
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