Change IS_OBJECT back to typeof == "object" and use IS_SPEC_OBJECT in Array.from and RegExp

src/js/array.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 1743 matching lines @@
 
   if (!IS_UNDEFINED(iterable)) {
     result = %IsConstructor(this) ? new this() : [];
 
     var iterator = GetIterator(items, iterable);
 
     k = 0;
     while (true) {
       var next = iterator.next();
 
-      if (!IS_OBJECT(next)) {
+      if (!IS_SPEC_OBJECT(next)) {
         throw MakeTypeError(kIteratorResultNotAnObject, next);
       }
 
       if (next.done) {
         result.length = k;
         return result;
       }
 
       nextValue = next.value;
       if (mapping) {
@@ skipping 175 matching lines @@
 %InstallToContext([
   "array_pop", ArrayPop,
   "array_push", ArrayPush,
   "array_shift", ArrayShift,
   "array_splice", ArraySplice,
   "array_slice", ArraySlice,
   "array_unshift", ArrayUnshift,
 ]);
 
 });