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

[Joshua Cranmer via llvm-commits]

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@@ -16464,21 +16464,13 @@ type.
 
 Semantics:
 """"""""""
+Follows the IEEE754 2008 semantics for minNum, except for handling of
++0.0 vs -0.0. This matches the behavior of libm's fmin.
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jcranmer-intel wrote:

IEEE 754 has the same indifference to the result of `minNum(-0.0, +0.0)`, it's not a deviation from the IEEE 754 specification.

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