[llvm] [SPIR-V] Lower llvm.x.with.overflow intrinsics (PR #95012)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic requested changes to this pull request.

Could you clarify why you need to do this?  The normal flow is that GlobalISel converts the intrinsic call to a generic instruction (G_SMULO etc.), and then LegalizeHelper converts that instruction into a legal instruction.

https://github.com/llvm/llvm-project/pull/95012