[llvm] [LVI] Handle icmp of ashr. (PR #68010)

[Amara Emerson via llvm-commits]

aemerson wrote:

ping @nikic I've been trying to get this in for a few months now. Should I just give up on this change? If so, I'd like to go ahead with https://reviews.llvm.org/D149918 so that we can re-commit the always-inliner change we had to back out early this year.

https://github.com/llvm/llvm-project/pull/68010