[llvm-branch-commits] [llvm] [AMDGPU][InsertWaitCnts] Move HWEvent analysis code (PR #202887)

[Matt Arsenault via llvm-branch-commits]

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@@ -30,5 +32,167 @@ void HWEventSet::dump() const {
   print(dbgs());
   dbgs() << "\n";
 }
+
+static std::optional<HWEvent>
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arsenm wrote:

I'd expect this to be a bitmask with a natural empty value instead of using optional 

https://github.com/llvm/llvm-project/pull/202887