Add streamed versions of getQualifiedNameAsString.

Move the cold virtual method getNameForDiagnostic out of line.

llvm-svn: 175966
diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index cdf1505..0db520e 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -190,8 +190,11 @@
 
   OS << Message;
 
-  if (const NamedDecl *DN = dyn_cast_or_null<NamedDecl>(TheDecl))
-    OS << " '" << DN->getQualifiedNameAsString() << '\'';
+  if (const NamedDecl *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) {
+    OS << " '";
+    DN->printQualifiedName(OS);
+    OS << '\'';
+  }
   OS << '\n';
 }