[llvm] [AMDGPU][NFC] Use a worklist and remember results (PR #129175)

[Matt Arsenault via llvm-commits]

================
@@ -19,6 +19,7 @@
 #include "llvm/IR/IntrinsicsR600.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Transforms/IPO/Attributor.h"
+#include <cstdint>
----------------
arsenm wrote:

Why is a new include needed? 

https://github.com/llvm/llvm-project/pull/129175