Allow us to ask for the access specifier of a translation unit

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68548 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index 615bf00..f098496 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -338,7 +338,8 @@
 
 #ifndef NDEBUG
 void Decl::CheckAccessDeclContext() const {
-  assert((Access != AS_none || !isa<CXXRecordDecl>(getDeclContext())) &&
+  assert((Access != AS_none || isa<TranslationUnitDecl>(this) ||
+          !isa<CXXRecordDecl>(getDeclContext())) &&
          "Access specifier is AS_none inside a record decl");
 }