[es6] parse arrow ConciseBody with accept_IN flag

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index be80956b69323bd8890d0da824f5f83cbfa2c36f..15bf2232d3ebd2de70cd7be43d15de5047f6c98d 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -1217,8 +1217,8 @@ FunctionLiteral* Parser::ParseLazy(Isolate* isolate, ParseInfo* info,
 
       if (ok) {
         checkpoint.Restore(&formals.materialized_literals_count);
-        Expression* expression =
-            ParseArrowFunctionLiteral(formals, formals_classifier, &ok);
+        Expression* expression = ParseArrowFunctionLiteral(
+            shared_info->accept_IN(), formals, formals_classifier, &ok);

[adamk, 2015/10/14 13:37:19]

So I patched this in locally, and just passed true here. My theory is that we
never would have succeeded in reifying any function with this error, so the bit
would never even get set. Indeed I'm having trouble seeing what problem that
would cause...

         if (ok) {
           // Scanning must end at the same position that was recorded
           // previously. If not, parsing has been interrupted due to a stack