Remove hacky stub for quantized ops (#22388)
Summary:
Effectively reverts https://github.com/pytorch/pytorch/pull/18267 - this was a temporary measure and is not used any more.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22388
Differential Revision: D16070725
Pulled By: dzhulgakov
fbshipit-source-id: ee5db11a608f248b0da981169d4cc90470fd482f
