[llvm] [InstCombine] Fold isnan idioms (PR #101510)

[Matt Arsenault via llvm-commits]

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@@ -363,8 +363,28 @@ static Value *foldLogOpOfMaskedICmps_NotAllZeros_BMask_Mixed(
   // deduce anything from it.
   // For example,
   // (icmp ne (A & 12), 0) & (icmp eq (A & 3), 1) -> no folding.
-  if ((*BCst & *DCst) == 0)
+  if ((*BCst & *DCst) == 0) {
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arsenm wrote:

!BCst->intersects(DCst)? 

https://github.com/llvm/llvm-project/pull/101510