Make sure mangling doesn't crash in another case.  Add some more tests.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91149 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 57f125e..afc70fa 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -548,7 +548,7 @@
     mangleFunctionEncoding(cast<FunctionDecl>(ND->getDeclContext()));
 
   Out << 'E';
-  mangleSourceName(ND->getIdentifier());
+  mangleUnqualifiedName(ND);
 }
 
 void CXXNameMangler::manglePrefix(const DeclContext *DC) {