[llvm] [SPIR-V] Stop emitting FPRoundingMode for arithmetic constrained intrinsics (PR #182742)

[Juan Manuel Martinez Caamaño via llvm-commits]

https://github.com/jmmartinez commented:

This patch seems reasonable to me, but it really bugs me that we're accepting LLVM-IR that we cannot lower in a semantically equivalent way.

I'm not sure which project uses these intrinsics; but I don't think they will be pleased when they debug the behavior when building using SPIRV.

https://github.com/llvm/llvm-project/pull/182742