Simon Pilgrim 61621f826a [TargetLowering] SimplifyDemandedBits - add basic KnownBits ZEXTLoad handling
We have to be careful in SimplifyDemandedBits with loads in case we attempt to combine back to a constant (which then gets turned into a constant pool load again), but we can at least set the upper KnownBits for a ZEXTLoad to zero.
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