[clang] [llvm] [AMDGPU] Adding the amdgpu-num-work-groups function attribute (PR #79035)

[Matt Arsenault via cfe-commits]

================
@@ -356,6 +356,19 @@ void AMDGPUTargetCodeGenInfo::setFunctionDeclAttributes(
     if (NumVGPR != 0)
       F->addFnAttr("amdgpu-num-vgpr", llvm::utostr(NumVGPR));
   }
+
+  if (const auto *Attr = FD->getAttr<AMDGPUNumWorkGroupsAttr>()) {
+    uint32_t X = Attr->getNumWorkGroupsX();
+    uint32_t Y = Attr->getNumWorkGroupsY();
+    uint32_t Z = Attr->getNumWorkGroupsZ();
+
+    if (X != 0 && Y != 0 && Z != 0) {
----------------
arsenm wrote:

shouldn't it try to set this if any dimension has a relevant value?

https://github.com/llvm/llvm-project/pull/79035
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