Remove exp10 in TH (unused)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/30422
Test Plan: Imported from OSS
Differential Revision: D18764280
Pulled By: VitalyFedyunin
fbshipit-source-id: 626b88a115f2efce4a53c6784f0a6660b36c97f9
