[clang] [HIP] Move HIP to the new driver by default (PR #123359)

[Henry Linjamäki via cfe-commits]

linehill wrote:

> I'd suggest you just try doing `--offload-new-driver` with `-###` and `-v` and see what doesn't work.

Running the `hipspv-toolchain.hip` case with the `--offload-new-driver` option reveals that it is missing steps for running custom pass plugin on the final device bitcode and SPIR-V translation*, crucial for chipStar. 

*: The translation step could be replaced with the SPIR-V backend if it is in good state for chipStar.


https://github.com/llvm/llvm-project/pull/123359