Support L__FUNCTION__ in microsoft mode, PR11789

Heavily based on a patch from
Aaron Wishnick <aaron.s.wishnick@gmail.com>.

I'll clean up the duplicated function in CodeGen as
a follow-up, later today or tomorrow.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159060 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/StmtDumper.cpp b/lib/AST/StmtDumper.cpp
index a57cce8..ce330e0 100644
--- a/lib/AST/StmtDumper.cpp
+++ b/lib/AST/StmtDumper.cpp
@@ -424,6 +424,7 @@
   default: llvm_unreachable("unknown case");
   case PredefinedExpr::Func:           OS <<  " __func__"; break;
   case PredefinedExpr::Function:       OS <<  " __FUNCTION__"; break;
+  case PredefinedExpr::LFunction:       OS <<  " L__FUNCTION__"; break;
   case PredefinedExpr::PrettyFunction: OS <<  " __PRETTY_FUNCTION__";break;
   }
 }