[llvm] [DAGCombine] Optimize away cond ? 1 : 0 post-legalization (PR #186771)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

I tried running some test that seemed to get stuck but I believe that was a blip - a rerun did fine. The Arm changes look OK to me, as far as I can see.

https://github.com/llvm/llvm-project/pull/186771