[llvm] [AArch64] Use umin for x != 0 when +cssc is enabled (PR #169159)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> I don't have commit access. If there are no other issues, could you please help me merge it?

I'll merge it tomorrow (assuming nobody else comments on the PR)

https://github.com/llvm/llvm-project/pull/169159