[llvm-branch-commits] [llvm] [AMDGPU][Attributor] Make `AAAMDWavesPerEU` honor existing attribute (PR #114438)

[Matt Arsenault via llvm-branch-commits]

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@@ -215,6 +215,19 @@ class AMDGPUInformationCache : public InformationCache {
     return ST.getWavesPerEU(F, FlatWorkGroupSize);
   }
 
+  std::optional<std::pair<unsigned, unsigned>>
+  getWavesPerEUAttr(const Function &F) {
+    Attribute Attr = F.getFnAttribute("amdgpu-waves-per-eu");
+    if (!Attr.isStringAttribute())
+      return std::nullopt;
+    auto Val = parseRangeAttribute(Attr.getValueAsString());
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arsenm wrote:

I don't see where this is defined 

https://github.com/llvm/llvm-project/pull/114438