[llvm] [GISel] LegalizationArtifactCombiner: Elide redundant G_SEXT_INREG (PR #93687)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

> The real reason the artifact combiner is there is because it's actually required in order for our legalization algorithm to terminate. We need to elide unlegalizable artifacts that cancel out in order for it to work at all.

I see, thanks.


https://github.com/llvm/llvm-project/pull/93687