Parse: Don't let BalancedDelimiterTracker consume cxx_defaultarg_end

It is not correct to let it consume the cxx_defaultarg_end token.  I'm
starting to wonder if it makes more sense to stop SkipUntil from
consuming such tokens.

llvm-svn: 225615
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
index 7ccd209..c9243d6 100644
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -1948,7 +1948,7 @@
   // token.
   if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
       P.Tok.isNot(tok::r_square) &&
-      P.SkipUntil(Close, FinalToken,
+      P.SkipUntil(Close, FinalToken, tok::cxx_defaultarg_end,
                   Parser::StopAtSemi | Parser::StopBeforeMatch) &&
       P.Tok.is(Close))
     LClose = P.ConsumeAnyToken();