Although patching SpiderMonkey is easy/safe? on this case, carrying this tiny 
update from one version to another may not be the best option;

A public method suggestion;

JS_PUBLIC_API(bool)
JS_IsRegExpObject(JSObject *obj) {
  return obj->is<RegExpObject>();
}

** I'm not sure the best method name here. (or JS::HandleObject as a parameter, 
additional checks etc.). Any one of them would work.


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