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

BUG=

Review URL: https://codereview.chromium.org/1463083004

Cr-Commit-Position: refs/heads/master@{#32143}

src/js/array.js

@@ -1761,7 +1761,7 @@ function ArrayFrom(arrayLike, mapfn, receiver) {
     while (true) {
       var next = iterator.next();
 
-      if (!IS_OBJECT(next)) {
+      if (!IS_SPEC_OBJECT(next)) {
         throw MakeTypeError(kIteratorResultNotAnObject, next);
       }
 

src/js/macros.py

@@ -95,7 +95,7 @@ macro IS_NUMBER(arg)            = (typeof(arg) === 'number');
 macro IS_STRING(arg)            = (typeof(arg) === 'string');
 macro IS_BOOLEAN(arg)           = (typeof(arg) === 'boolean');
 macro IS_SYMBOL(arg)            = (typeof(arg) === 'symbol');
-macro IS_OBJECT(arg)            = (typeof(arg) === 'object' && arg !== null);
+macro IS_OBJECT(arg)            = (typeof(arg) === 'object');
 macro IS_ARRAY(arg)             = (%_IsArray(arg));
 macro IS_DATE(arg)              = (%_IsDate(arg));
 macro IS_FUNCTION(arg)          = (%_IsFunction(arg));

src/js/regexp.js

@@ -45,7 +45,7 @@ var RegExpLastMatchInfo = new InternalPackedArray(
 // -------------------------------------------------------------------
 
 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);