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

[YunQiang Su via llvm-commits]

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@@ -16625,20 +16639,34 @@ type.
 
 Semantics:
 """"""""""
-Follows the IEEE-754 semantics for maxNum except for the handling of
-signaling NaNs. This matches the behavior of libm's fmax.
+Follows the IEEE-754 semantics for minNum, except that -0.0 < +0.0 for the purposes
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wzssyqa wrote:

I try to not use the words like `change` here.  In the IEEE754 wordings, 2019 removes `minNum/maxNum`, and introduces new `minimumNumber/maximumNumber`.

https://github.com/llvm/llvm-project/pull/112852