[llvm] [InstCombine] Prevent constant operand shrinkage on returns of zero-extension ANDs (PR #146201)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

`TLI->targetShrinkDemandedConstant` is responsible for the same logic to preserve zext patterns. I'd like to add a new TLI hook `targetShrinkDemandedConstant(BitwiseOp, RHSC, DemandedBits)`, then implement this transform in a new CodeGen Pass (before CodeGenPrepare).


https://github.com/llvm/llvm-project/pull/146201