Bug 1041586 - Implement Symbol.isConcatSpreadable. r=arai

js/src/jsapi.h

@@ -4872,6 +4872,7 @@ GetSymbolDescription(HandleSymbol symbol);
 
 /* Well-known symbols. */
 #define JS_FOR_EACH_WELL_KNOWN_SYMBOL(macro) \
+    macro(isConcatSpreadable) \
     macro(iterator) \
     macro(match) \
     macro(replace) \

js/src/tests/ecma_6/Symbol/well-known.js

@@ -2,6 +2,7 @@
  * http://creativecommons.org/licenses/publicdomain/ */
 
 var names = [
+    "isConcatSpreadable",
     "iterator",
     "match",
     "replace",