[llvm] [LLVM][CodeGen] Flooring BW to 1 in isSaturatingMinMax (PR #160637)

[David Green via llvm-commits]

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@@ -6047,7 +6047,7 @@ static SDValue isSaturatingMinMax(SDValue N0, SDValue N1, SDValue N2,
   }
 
   if (MaxC == 0 && MinCPlus1.isPowerOf2()) {
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davemgreen wrote:

Add a check that MinC != 0 to this too instead. It is not really a saturate if both limits are 0.

https://github.com/llvm/llvm-project/pull/160637