Remove exp10 in TH (unused)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/30422
Test Plan: Imported from OSS
Differential Revision: D18764186
Pulled By: VitalyFedyunin
fbshipit-source-id: 9343a5a7e4edf61ba3b85eaf846b2e149ed6529a
