This removes RegExpPrototypeSpeciesGetter and IteratorPrototypeIterator and
uses ReturnReceiver builtin instead.

This patch also ports the PromiseSpecies to TF by reusing this
builtin.

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2590373002
Cr-Commit-Position: refs/heads/master@{#41879}