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

[Matt Arsenault via llvm-commits]

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@@ -16574,21 +16574,35 @@ type.
 
 Semantics:
 """"""""""
+Follows the IEEE-754 semantics for minNum, except that -0.0 < +0.0 for the purposes
+of this intrinsic. As for signaling NaNs, per the IEEE-754 semantics, if either operand
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arsenm wrote:

This is the IEEE-754 behavior (just the 2019 version)

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