[Clang] Check that we have the correct RecordDecl (llvm#111448)

Ensure we have the correct RecordDecl before returning the Expr we're
looking for.

clang/lib/CodeGen/CGExpr.cpp

@@ -1096,7 +1096,7 @@ class StructAccessBase
   }
   const Expr *VisitCastExpr(const CastExpr *E) {
     if (E->getCastKind() == CK_LValueToRValue)
-      return E;
+      return IsExpectedRecordDecl(E) ? E : nullptr;
     return Visit(E->getSubExpr());
   }
   const Expr *VisitParenExpr(const ParenExpr *E) {