[clang-tools-extra] [flang] [clang] [libc] [libcxx] [compiler-rt] [llvm] [Clang] Generate the GEP instead of adding AST nodes (PR #73730)

[Bill Wendling via cfe-commits]

================
@@ -8522,6 +8522,22 @@ bool Sema::CheckCountedByAttr(Scope *S, const FieldDecl 
*FD) {
     }
   }
 
+  // We don't support 'counted_by' on flexible array members in substructures.
+  const DeclContext *DC = FD->getParent();
+  while (const auto *RD = dyn_cast<RecordDecl>(DC)) {
+    if (!RD->isAnonymousStructOrUnion() ||
+        !isa<RecordDecl>(RD->getLexicalParent()))
+      break;
+    DC = RD->getLexicalParent();
+  }
----------------
bwendling wrote:

Not really. I'm checking to make sure that the `RecordDecl`'s lexical parent is 
also a `RecordDecl`. I need to do this, otherwise `DC` will end up as 
`TranslationUnit` in some cases.

https://github.com/llvm/llvm-project/pull/73730
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