[clang] [Clang][Sema] Use the correct lookup context when building overloaded 'operator->' in the current instantiation (PR #104458)

[Aaron Ballman via cfe-commits]

================
@@ -7981,7 +7969,7 @@ ExprResult Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base,
     SmallVector<FunctionDecl*, 8> OperatorArrows;
     CTypes.insert(Context.getCanonicalType(BaseType));
 
-    while (BaseType->isRecordType()) {
+    while (BaseType->getAsRecordDecl()) {
----------------
AaronBallman wrote:

`isa<InjectedClassNameType, RecordType>(BaseType)` seems more clear, WDYT?

https://github.com/llvm/llvm-project/pull/104458