Add streamed versions of getQualifiedNameAsString.

Move the cold virtual method getNameForDiagnostic out of line.

llvm-svn: 175966
diff --git a/clang/lib/Frontend/ASTConsumers.cpp b/clang/lib/Frontend/ASTConsumers.cpp
index 687fc00..936bd2f 100644
--- a/clang/lib/Frontend/ASTConsumers.cpp
+++ b/clang/lib/Frontend/ASTConsumers.cpp
@@ -104,7 +104,8 @@
     bool shouldWalkTypesOfTypeLocs() const { return false; }
 
     virtual bool VisitNamedDecl(NamedDecl *D) {
-      Out << D->getQualifiedNameAsString() << "\n";
+      D->printQualifiedName(Out);
+      Out << '\n';
       return true;
     }