[llvm] IVDesc: unify RecurKinds IAnyOf and FAnyOf (PR #118393)

[Mel Chen via llvm-commits]

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@@ -500,7 +497,7 @@ bool RecurrenceDescriptor::AddReductionVar(
   // This means we have seen one but not the other instruction of the
   // pattern or more than just a select and cmp. Zero implies that we saw a
   // llvm.min/max intrinsic, which is always OK.
-  if (isMinMaxRecurrenceKind(Kind) && NumCmpSelectPatternInst != 2 &&
+  if (isMinMaxRecurrenceKind(Kind) && NumCmpSelectPatternInst != 1 &&
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Mel-Chen wrote:

I realize that removing `NumCmpSelectPatternInst` might not be as straightforward as I initially thought. 
Could we instead separate the changes related to AnyOf and modify them independently? I’d prefer not to introduce changes to other reduction behaviors while working on AnyOf.

https://github.com/llvm/llvm-project/pull/118393