[llvm] [AMDGPU] Replace dynamic VGPR feature with attribute (PR #133444)

[Matt Arsenault via llvm-commits]

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@@ -2126,6 +2126,11 @@ bool getHasDepthExport(const Function &F) {
   return F.getFnAttributeAsParsedInteger("amdgpu-depth-export", 0) != 0;
 }
 
+bool getIsDynamicVGPR(const Function &F) {
+  return F.hasFnAttribute("amdgpu-dynamic-vgpr") &&
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arsenm wrote:

Shouldn't need to pre-check hasFnAttribute when querying the value 

https://github.com/llvm/llvm-project/pull/133444