[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.

Thank you for the patch! Verified with OpenCL CTS and benchmarks. There are no regressions. LGTM!

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