[llvm] Revert "LangRef: Clarify llvm.minnum and llvm.maxnum about sNaN and signed zero (#112852)" (PR #168838)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> #112852 said it was "clarifying" the semantics, so does reverting that PR make things less clear? Though looking at the actual text, it seems fairly clear, at least about the signed zero case -- either result is returned.

I think it's just "clarifying" for some targets and making the language semantics more confusing and conflict.

https://github.com/llvm/llvm-project/pull/168838