Unwrap sccache post-build for ROCm compilations. (#22743)
Summary:
The sccache wrapping strategy causes problems for at-runtime kernel
compilation of MIOpen kernels. We therefore - after the builds of
caffe2/pytorch are complete - unwrap sccache again by moving the clang-9
actual binary back into its original place.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22743
Differential Revision: D16283329
Pulled By: bddppq
fbshipit-source-id: 4fcdc92be295d5ea9aba75c30e39af1a18a80c13
