[llvm] [InstCombine] Improve folding of `icmp pred (and X, Mask/~Mask), Y)` (PR #81562)

[Yingwei Zheng via llvm-commits]

================
@@ -4068,11 +4068,115 @@ Instruction *InstCombinerImpl::foldSelectICmp(ICmpInst::Predicate Pred,
   return nullptr;
 }
 
+// Returns of V is a Mask ((X + 1) & X == 0) or ~Mask (-Pow2OrZero)
----------------
dtcxzyw wrote:

```suggestion
// Returns whether V is a Mask ((X + 1) & X == 0) or ~Mask (-Pow2OrZero)
```

https://github.com/llvm/llvm-project/pull/81562