[-fms-extensions] Add support for __FUNCDNAME__

Summary:
Similar to __FUNCTION__, MSVC exposes the name of the enclosing mangled
function name via __FUNCDNAME__.  This implementation is very naive and
unoptimized, it is expected that __FUNCDNAME__ would be used rarely in
practice.

Reviewers: rnk, rsmith, thakis

CC: cfe-commits, silvas

Differential Revision: http://llvm-reviews.chandlerc.com/D2109

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194181 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseTentative.cpp b/lib/Parse/ParseTentative.cpp
index 2dc16d3..b35d632 100644
--- a/lib/Parse/ParseTentative.cpp
+++ b/lib/Parse/ParseTentative.cpp
@@ -940,6 +940,7 @@
   case tok::kw___imag:
   case tok::kw___real:
   case tok::kw___FUNCTION__:
+  case tok::kw___FUNCDNAME__:
   case tok::kw_L__FUNCTION__:
   case tok::kw___PRETTY_FUNCTION__:
   case tok::kw___has_nothrow_assign: