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

[Matt Arsenault 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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arsenm wrote:

Same as above, this changed between IEEE-754 2008 and 2019

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