[llvm] [Valuetracking] Use all FPClasses ordering information for min/max (PR #199651)

[Niklas Ulvinge via llvm-commits]

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@@ -173,3 +173,24 @@ bool llvm::cannotOrderStrictlyLessEq(FPClassTest LHS, FPClassTest RHS,
                                      bool OrderedZeroSign) {
   return cannotOrderStrictlyGreaterImpl(RHS, LHS, true, OrderedZeroSign);
 }
+
+FPClassTest llvm::orderedStrictlyLess(FPClassTest Mask) {
+  // Ignores NaN
+  unsigned NewMask = Mask & ~fcNan;
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nulvinge wrote:

countr_zero, countl_zero, maskTrailingOnes, maskLeadingOnes only work on unsigned, so we must convert to unsigned, but I changed the type to FPClassTest, which made the code a bit cleaner.

https://github.com/llvm/llvm-project/pull/199651