[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) {
+      std::string AttrVal = llvm::utostr(X) + std::string(", ") +
+                            llvm::utostr(Y) + std::string(", ") +
+                            llvm::utostr(Z);
----------------
arsenm wrote:

SmallString + raw_svector_ostream 

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