[llvm] [SPIR-V] Avoid typed pointers for global variables (PR #201203)

[Viktoria Maximova via llvm-commits]

https://github.com/vmaksimo commented:

> This will break the bitcode parsing of the serialized module.

Is it possible to provide a negative test example in llvm-lit infrastructure? Guess it'll clarify the purpose of the change more

https://github.com/llvm/llvm-project/pull/201203