[clang] [llvm] [HIPSPV] Add in-tree SPIR-V backend support for chipStar (PR #206910)

[Yaxun Liu via cfe-commits]

yxsamliu wrote:

LGTM overall. The `-f[no-]integrated-objemitter` selection looks right, and keeping the chipStar pipeline in HIPSPV avoids linker-wrapper duplication. I left two small comments.

https://github.com/llvm/llvm-project/pull/206910