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[SelectionDAG] computeKnownBits/ComputeNumSignBits - cleanup demanded/unknown…

Description

[SelectionDAG] computeKnownBits/ComputeNumSignBits - cleanup demanded/unknown paths. NFCI.

Merge the calls, just adjust the demandedelts if we have a valid extract_subvector constant index, else demand all elts.

Details

Committed
RKSimonSun, Sep 22, 11:47 AM
Parents
rL372520: [XRay] Silence static analyzer dyn_cast<BufferExtents> null dereference warning.
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