[es6] Spread in array literals

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index 7269ea66775e1e353e3ec24c58e70ccf641da05f..e8a3879ca3564bb9927510f26eaa5cc7bf76b4a0 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -54,6 +54,7 @@ var CALL_NON_FUNCTION;
 var CALL_NON_FUNCTION_AS_CONSTRUCTOR;
 var CALL_FUNCTION_PROXY;
 var CALL_FUNCTION_PROXY_AS_CONSTRUCTOR;
+var CONCAT_ITERABLE_TO_ARRAY;
 var APPLY_PREPARE;
 var REFLECT_APPLY_PREPARE;
 var REFLECT_CONSTRUCT_PREPARE;
@@ -726,6 +727,11 @@ REFLECT_CONSTRUCT_PREPARE = function REFLECT_CONSTRUCT_PREPARE(
 }
 
 
+CONCAT_ITERABLE_TO_ARRAY = function CONCAT_ITERABLE_TO_ARRAY(iterable) {
+  return %$concatIterableToArray(this, iterable);
+};
+
+
 STACK_OVERFLOW = function STACK_OVERFLOW(length) {
   throw %MakeRangeError(kStackOverflow);
 }