[es6] implement spread calls

src/preparser.cc

Index: src/preparser.cc
diff --git a/src/preparser.cc b/src/preparser.cc
index 5a6a094f6af52b7ba025e9d4ff9c0450499497f7..1bc7777fc9b94dfccdac42bf1de82f6f9552f12f 100644
--- a/src/preparser.cc
+++ b/src/preparser.cc
@@ -1043,7 +1043,10 @@ PreParser::Expression PreParser::ParseV8Intrinsic(bool* ok) {
   }
   // Allow "eval" or "arguments" for backward compatibility.
   ParseIdentifier(kAllowEvalOrArguments, CHECK_OK);
-  ParseArguments(ok);
+  Scanner::Location spread_pos;
+  ParseArguments(&spread_pos, ok);
+
+  DCHECK(!spread_pos.IsValid());
 
   return Expression::Default();
 }