[clang] [Clang][OpenCL][AMDGPU] Allow a kernel to call another kernel (PR #115821)

[Aniket Lal via cfe-commits]

================
@@ -2343,6 +2343,15 @@ void CodeGenModule::ConstructAttributeList(StringRef Name,
   // Collect function IR attributes from the CC lowering.
   // We'll collect the paramete and result attributes later.
   CallingConv = FI.getEffectiveCallingConvention();
+  GlobalDecl GD = CalleeInfo.getCalleeDecl();
+  const Decl *TargetDecl = CalleeInfo.getCalleeDecl().getDecl();
+  if (TargetDecl) {
+    if (auto FD = dyn_cast<FunctionDecl>(TargetDecl)) {
+      if (FD->hasAttr<OpenCLKernelAttr>() &&
+          GD.getKernelReferenceKind() == KernelReferenceKind::Stub)
+        CallingConv = llvm::CallingConv::C;
----------------
lalaniket8 wrote:

Moved change of calling convention to `CodeGenTypes::arrangeFunctionDeclaration()` so that we obtain the correct `CGFunctionInfo`.

https://github.com/llvm/llvm-project/pull/115821