[clang] [llvm] [AMDGPU][Clang] Allow amdgpu-waves-per-eu attribute to lower target occupancy range (PR #138284)

[Matt Arsenault via cfe-commits]

================
@@ -2519,6 +2519,29 @@ void Verifier::verifyFunctionAttrs(FunctionType *FT, 
AttributeList Attrs,
       CheckFailed("invalid value for 'denormal-fp-math-f32' attribute: " + S,
                   V);
   }
+
+  if (TT.isAMDGPU()) {
+    if (auto A = Attrs.getFnAttr("amdgpu-waves-per-eu"); A.isValid()) {
----------------
arsenm wrote:

Probably should split this into a separate function 

https://github.com/llvm/llvm-project/pull/138284
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