Backed out changeset db1b027cbeb1 (bug 1041586) for assertion failures in expression-autopsy.js

js/src/jsapi.h

@@ -4872,7 +4872,6 @@ 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

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