Fix printing of member references to avoid displaying implicitly-generated member references, e.g., for anonymous struct/unions or implicit 'this' in member functions

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/StmtPrinter.cpp b/lib/AST/StmtPrinter.cpp
index 679c897..7456e8c 100644
--- a/lib/AST/StmtPrinter.cpp
+++ b/lib/AST/StmtPrinter.cpp
@@ -757,8 +757,10 @@
   OS << ")";
 }
 void StmtPrinter::VisitMemberExpr(MemberExpr *Node) {
-  PrintExpr(Node->getBase());
-  OS << (Node->isArrow() ? "->" : ".");
+  if (!Node->getBase()->isImplicit()) {
+    PrintExpr(Node->getBase());
+    OS << (Node->isArrow() ? "->" : ".");
+  }
   OS << Node->getMemberDecl()->getNameAsString();
 }
 void StmtPrinter::VisitExtVectorElementExpr(ExtVectorElementExpr *Node) {