[clang] [HIP] Pass backend options to non-LTO wrapper codegen (PR #206591)

[Yaxun Liu via cfe-commits]

yxsamliu wrote:

Closing this for now. #206961 reverted the default non-RDC `--no-lto` linker-wrapper path, so this PR no longer fixes the default HIP path.

If we add that non-LTO wrapper codegen path back later, we should make sure device `-mllvm` options are still passed to the backend.

https://github.com/llvm/llvm-project/pull/206591