[llvm] [SelectionDAG] Preserver poison for abs INT_MIN lowering (PR #183851)

[Craig Topper via llvm-commits]

topperc wrote:

> @topperc @RKSimon this patch is meant to address undefined behavior of `abs(INT_MIN)` in PTX. We need a TTI hook for NVPTX.

Does this mean LLVM is miscompiling for NVPTX today?

https://github.com/llvm/llvm-project/pull/183851