Fix SELECTED_OP_LIST file path issue (#33942)
Summary:
If SELECTED_OP_LIST is specified as a relative path in command line, CMake build will fail.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33942
Differential Revision: D20392797
Pulled By: ljk53
fbshipit-source-id: dffeebc48050970e286cf263bdde8b26d8fe4bce
