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

[Matt Arsenault via llvm-commits]

arsenm wrote:

> for special handling we have there for aggregates. 

These shouldn't need treatment as aggregates, they will IRTranslate to a return of tuple? 

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