[llvm] [SPIR-V] Insert a bitcast before load/store instruction to keep SPIR-V code valid (PR #84069)

[Michal Paszkowski via llvm-commits]

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

I think the pull request looks good in the current shape. I am open to have it merged to not block finding other issues. However, let's discuss the general direction in the Monday meeting.

https://github.com/llvm/llvm-project/pull/84069