[llvm] [AMDGPU] Eliminate likely-spurious execz checks via intrinsic argument (PR #123749)

[Matt Arsenault via llvm-commits]

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@@ -385,6 +418,62 @@ bool SIAnnotateControlFlow::run() {
   return Changed;
 }
 
+bool LikelyVaryingHeuristic::isRelevantSourceOfDivergence(
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arsenm wrote:

Rephrase, these are all functions of the workitem ID 

https://github.com/llvm/llvm-project/pull/123749