Improve hip-clang support in build_amd.py (#23699)
Summary:
Use the supported way to differentiate and automatically switch between hip-clang and hcc hipification in build_amd.py.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23699
Differential Revision: D16627326
Pulled By: vincentqb
fbshipit-source-id: 977003174395fb69cf0c96c89232bd6214780cd8
