WIP: Implement ES6 Spread-calls

src/preparser.cc

Index: src/preparser.cc
diff --git a/src/preparser.cc b/src/preparser.cc
index 9e72422eb7deb1c28f824ac86937068d2eb5ddbe..8e34f4cae245e83f9c98950daab61876c89e3eef 100644
--- a/src/preparser.cc
+++ b/src/preparser.cc
@@ -1016,7 +1016,15 @@ 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);
+
+  if (spread_pos.IsValid()) {
+    // Maybe support spread calls for intrinsics/runtime calls?
+    PreParserTraits::ReportMessageAt(spread_pos, "spreadcall_intrinsic");
+    *ok = false;
+    return Expression::Default();
+  }
 
   return Expression::Default();
 }