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

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 37c3bfe476e93b41078e77d9daf55a426469b03c..962723d4e8811b831b1f637b003a1e32a5dd887f 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3754,14 +3754,9 @@ Local<v8::RegExp> v8::RegExp::New(Handle<String> pattern,
   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));