Resubmit more code fakefp16 mapping unification (#32798)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32798
ATT
Test Plan: unittests
Reviewed By: amylittleyang
Differential Revision: D19632251
fbshipit-source-id: 670004050d67415bb24392f3520afa32b64ce740
