[llvm] [SPIR-V] Do not use OpenCL metadata for ptr element type resolution (PR #82678)

[Michal Paszkowski via llvm-commits]

michalpaszkowski wrote:

The patch is mostly finished and ready for review. I might be able to remove some more dead code (working on this), need to rebase, and will add a couple more tests by the end of this week.

In the next patch, I am planning to remove the rest of SPIRVMetadata.

https://github.com/llvm/llvm-project/pull/82678