[InstCombine] Shrink add's RHS constant based on LHSKnown #111233
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This was referenced Oct 5, 2024
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If lowbits are not demanded and lowbits in LHS are known zero, we can further optimize RHS based on LHSKnown. This patch only shrinks the RHS constant since recursively calling
SimplifyDemandedBitson RHS again may be expensive.