[clang] [HIP] Replace use of `llvm-mc` with `clang` (PR #112041)

[Matt Arsenault via cfe-commits]

arsenm wrote:

I fixed an apparent missing test dependency in 1ac6ef5af28b72e534496a9833a2b75a2aba66cc and this commit removed the llvm-mc dependency 

https://github.com/llvm/llvm-project/pull/112041