[clang] [clang][AMDGPU] Clean-up handling of named barrier type (PR #207687)

[Pierre van Houtryve via cfe-commits]

================
@@ -1062,4 +1062,84 @@ bool DiagnoseUnguardedBuiltins::VisitCallExpr(CallExpr *CE) {
 void SemaAMDGPU::DiagnoseUnguardedBuiltinUsage(FunctionDecl *FD) {
   DiagnoseUnguardedBuiltins(SemaRef).IssueDiagnostics(FD->getBody());
 }
+
+static FieldDecl *getNamedBarrierField(const RecordDecl *R) {
+  for (FieldDecl *FD : R->fields()) {
+    QualType FDTy = FD->getType();
+    if (FDTy->isAMDGPUNamedBarrierTypeOrWrapper())
+      return FD;
+  }
+
+  return nullptr;
+}
+
+void SemaAMDGPU::checkNamedBarrierWrapper(RecordDecl *R) {
+  if (R->isInvalidDecl())
----------------
Pierre-vh wrote:

Should this be restricted to AMDGPU targets only ? Otherwise it runs on all class declarations.
What's the easiest way to check if we have any AMDGPU target feature available on the target/aux target?

https://github.com/llvm/llvm-project/pull/207687