Addressing Mads' comments from http://codereview.chromium.org/3585010/show.

src/api.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3736 matching lines @@
       i::Vector<const char>(flags_buf, num_flags));
 }
 
 
 Local<v8::RegExp> v8::RegExp::New(Handle<String> pattern,
                                   Flags flags) {
   EnsureInitialized("v8::RegExp::New()");
   LOG_API("RegExp::New");
   ENTER_V8;
   EXCEPTION_PREAMBLE();
-  i::Handle<i::String> flags_string = RegExpFlagsToString(flags);
-  i::Object** argv[2] = {
-    i::Handle<i::Object>::cast(Utils::OpenHandle(*pattern)).location(),
-    i::Handle<i::Object>::cast(flags_string).location()
-  };
-  i::Handle<i::Object> obj = i::Execution::New(
-      i::Handle<i::JSFunction>(i::Top::global_context()->regexp_function()),
-      2, argv,
+  i::Handle<i::JSRegExp> obj = i::Execution::NewJSRegExp(
+      Utils::OpenHandle(*pattern),
+      RegExpFlagsToString(flags),
       &has_pending_exception);
   EXCEPTION_BAILOUT_CHECK(Local<v8::RegExp>());
   return Utils::ToLocal(i::Handle<i::JSRegExp>::cast(obj));
 }
 
 
 Local<v8::String> v8::RegExp::GetSource() const {
   if (IsDeadCheck("v8::RegExp::GetSource()")) return Local<v8::String>();
   i::Handle<i::JSRegExp> obj = Utils::OpenHandle(this);
   return Utils::ToLocal(i::Handle<i::String>(obj->Pattern()));
@@ skipping 1199 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal