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

src/js/regexp.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) {
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
@@ skipping 27 matching lines @@
  2,                 // REGEXP_NUMBER_OF_CAPTURES
  "",                // Last subject.
  UNDEFINED,         // Last input - settable with RegExpSetInput.
  0,                 // REGEXP_FIRST_CAPTURE + 0
  0                  // REGEXP_FIRST_CAPTURE + 1
 );
 
 // -------------------------------------------------------------------
 
 function IsRegExp(o) {
-  if (!IS_OBJECT(o)) return false;
+  if (!IS_SPEC_OBJECT(o)) return false;
   var is_regexp = o[matchSymbol];
   if (!IS_UNDEFINED(is_regexp)) return TO_BOOLEAN(is_regexp);
   return IS_REGEXP(o);
 }
 
 
 // ES6 section 21.2.3.2.2
 function RegExpInitialize(object, pattern, flags) {
   pattern = IS_UNDEFINED(pattern) ? '' : TO_STRING(pattern);
   flags = IS_UNDEFINED(flags) ? '' : TO_STRING(flags);
@@ skipping 473 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.RegExpExec = DoRegExpExec;
   to.RegExpExecNoTests = RegExpExecNoTests;
   to.RegExpLastMatchInfo = RegExpLastMatchInfo;
   to.RegExpTest = RegExpTest;
 });
 
 })