[clang] [llvm] [AMDGPU] Introduce asyncmark/wait intrinsics (PR #173259)

[Pierre van Houtryve via cfe-commits]

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@@ -2517,6 +2740,11 @@ bool WaitcntBrackets::merge(const WaitcntBrackets &Other) {
     }
   }
 
+  StrictDom |= mergeAsyncMarkers(MergeInfos, Other.AsyncMarkers);
+  for (auto T : inst_counter_types(Context->MaxCounter)) {
+    StrictDom |= mergeScore(MergeInfos[T], AsyncScore[T], Other.AsyncScore[T]);
+  }
----------------
Pierre-vh wrote:

```suggestion
  for (auto T : inst_counter_types(Context->MaxCounter)) 
    StrictDom |= mergeScore(MergeInfos[T], AsyncScore[T], Other.AsyncScore[T]);
```

https://github.com/llvm/llvm-project/pull/173259