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

[Joshua Cranmer via llvm-commits]

================
@@ -1021,13 +1021,20 @@ enum NodeType {
   LRINT,
   LLRINT,
 
-  /// FMINNUM/FMAXNUM - Perform floating-point minimum or maximum on two
-  /// values.
+  /// FMINNUM/FMAXNUM - Perform floating-point minimum maximum on two values,
+  /// following IEEE-754 definitions.
----------------
jcranmer-intel wrote:

Add "except for signed zero behavior"

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