[llvm] [SPIR-V] Disable Machine Sink pass in SPIR-V Backend (PR #116060)

[Nathan Gauër via llvm-commits]

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

LGTM for this PR.
Once https://github.com/llvm/llvm-project/pull/110507 is merged, shall the Machine Sink pass be updated to also use TII to query `isPhi`?

https://github.com/llvm/llvm-project/pull/116060