Switch to a more natural formatting of the macro name printing.
Suggested by John McCall.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142836 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/TextDiagnostic.cpp b/lib/Frontend/TextDiagnostic.cpp
index 8b901ae..425bc26 100644
--- a/lib/Frontend/TextDiagnostic.cpp
+++ b/lib/Frontend/TextDiagnostic.cpp
@@ -760,8 +760,8 @@
 
   llvm::SmallString<100> MessageStorage;
   llvm::raw_svector_ostream Message(MessageStorage);
-  Message << "expanded from macro: "
-          << getImmediateMacroName(MacroLoc, SM, LangOpts);
+  Message << "expanded from macro '"
+          << getImmediateMacroName(MacroLoc, SM, LangOpts) << "'";
   emitDiagnostic(SM.getSpellingLoc(Loc), DiagnosticsEngine::Note,
                  Message.str(),
                  Ranges, ArrayRef<FixItHint>());