[llvm] [SPIR-V][Codegen] Represent the property of the target to declare and use typed pointers and update MachineVerifier to use it (PR #110270)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

If you need an opcode to represent a point in the code where the operand needs to be inferred to a different pointer type than result, please add a new target-specific opcode for that, instead of trying to reuse G_BITCAST.

https://github.com/llvm/llvm-project/pull/110270