Linker version script to hide LLVM symbols (#62906)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/62906
Test Plan: Imported from OSS
Reviewed By: navahgar
Differential Revision: D30193893
Pulled By: bertmaher
fbshipit-source-id: 9b189bfd8d4c52e8dc4296a4bed517ff44994ba0
