Get rid of _th_reciprocal_. (#25507)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25507
It doesn't seem to be used.
Test Plan: Imported from OSS
Differential Revision: D17163584
Pulled By: gchanan
fbshipit-source-id: 7409cc06bf84863bd14aea060c755d0f162d2aec
