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

src/js/regexp.js

Index: src/js/regexp.js
diff --git a/src/js/regexp.js b/src/js/regexp.js
index 4a5c7033e92a4b516f65c4f4a546e8842032cc58..021e60b8b395e008926d5851b45d4e07769bfa60 100644
--- a/src/js/regexp.js
+++ b/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);