[clang] [CIR] Add builtin operator new/delete (PR #168578)

[Andy Kaylor via cfe-commits]

================
@@ -610,6 +610,33 @@ static RValue emitNewDeleteCall(CIRGenFunction &cgf,
   return rv;
 }
 
+RValue CIRGenFunction::emitNewOrDeleteBuiltinCall(const FunctionProtoType *type,
+                                                  const CallExpr *callExpr,
+                                                  bool isDelete) {
+  CallArgList args;
+  emitCallArgs(args, type, callExpr->arguments());
+  // Find the allocation or deallocation function that we're calling.
+  ASTContext &astContext = getContext();
+  DeclarationName name = astContext.DeclarationNames.getCXXOperatorName(
+      isDelete ? OO_Delete : OO_New);
+
+  clang::DeclContextLookupResult lookupResult =
+      astContext.getTranslationUnitDecl()->lookup(name);
+  for (const auto *decl : lookupResult) {
+    if (const auto *funcDecl = dyn_cast<FunctionDecl>(decl)) {
+      if (astContext.hasSameType(funcDecl->getType(), QualType(type, 0))) {
+        // Used for -fsanitize=alloc-token
+        assert(!cir::MissingFeatures::allocToken());
----------------
andykaylor wrote:

We've been wildly inconsistent about that, but I agree that we should do better.

https://github.com/llvm/llvm-project/pull/168578