Fix a minor crash bug with constructs like Obj.Class::ENUM_VALUE.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109537 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaExpr.cpp

@@ -2628,12 +2628,12 @@ bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
       return false;
 
     // Note that we use the DC of the decl, not the underlying decl.
-    CXXRecordDecl *RecordD = cast<CXXRecordDecl>((*I)->getDeclContext());
-    while (RecordD->isAnonymousStructOrUnion())
-      RecordD = cast<CXXRecordDecl>(RecordD->getParent());
+    DeclContext *DC = (*I)->getDeclContext();
+    while (DC->isTransparentContext())
+      DC = DC->getParent();
 
     llvm::SmallPtrSet<CXXRecordDecl*,4> MemberRecord;
-    MemberRecord.insert(RecordD->getCanonicalDecl());
+    MemberRecord.insert(cast<CXXRecordDecl>(DC)->getCanonicalDecl());
 
     if (!IsProvablyNotDerivedFrom(*this, BaseRecord, MemberRecord))
       return false;

test/SemaCXX/qualified-member-enum.cpp

@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s 
+
+// Check that this doesn't crash.
+struct A {
+  enum {LABEL};
+};
+int f() {
+  return A().A::LABEL;
+}
+