[clang] [clang][Driver][SPIR-V] Allow linking IR using llvm-link (PR #169572)

[Nick Sarnie via cfe-commits]

sarnex wrote:

Do you mean change the way to specify this behavior from the currently proposed `-emit-llvm (no -c)` to `-fuse-ld=llvm-link`?

https://github.com/llvm/llvm-project/pull/169572