[clang] [clang-repl] Add OffloadType enum and HIP device parser skeleton (PR #231391)

[Yaxun Liu via cfe-commits]

https://github.com/yxsamliu approved this pull request.

LGTM. The earlier issues are fixed. Adding the HIP test in #231783 is reasonable. One small nit: please update the description to say the HIP constructor checks the AMDGPU target triple.

https://github.com/llvm/llvm-project/pull/231391