[llvm] [X86] ICMP EQ/NE MIN_SIGNED_INT - avoid immediate argument by using NEG + SETO/SETNO (PR #94948)

[via llvm-commits]

aengelke wrote:

> What benefits does dec have other neg?

None. My thinking was just that cmp x,1 for the last use of x could be combined later into dec when code size is important (-Os?) whereas for neg the distinction needs to be made here (sub 0,x vs sub x,1).

https://github.com/llvm/llvm-project/pull/94948