[llvm] [ValueTracking] Analyze `Select` in `isKnownNonEqual`. (PR #68427)

[Nikita Popov via llvm-commits]

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@@ -3142,6 +3159,9 @@ static bool isKnownNonEqual(const Value *V1, const Value *V2, unsigned Depth,
     };
   }
 
+  if (isNonEqualSELECT(V1, V2, Depth, Q) || isNonEqualSELECT(V2, V1, Depth, Q))
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nikic wrote:

What I meant here is that if isNonEqualSelect returns `false`, then the second isNonEqualSelect call with swapped operands is also going to return false. Not super important though.

https://github.com/llvm/llvm-project/pull/68427