[clang] [Driver][KCFI] Forward -fsanitize-kcfi-hash= to cc1 (PR #214827)

[Fangrui Song via cfe-commits]

MaskRay wrote:

Agent-generates PRs tend to have very verbose comments and commit messages. Please spend some efforts to trim them for future contribution.

https://github.com/llvm/llvm-project/pull/214827