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Commit c05a1110 authored by Simon Pilgrim's avatar Simon Pilgrim
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[SelectionDAG] ComputeKnownBits - merge getValidMinimumShiftAmountConstant()... 

[SelectionDAG] ComputeKnownBits - merge getValidMinimumShiftAmountConstant() and generic ISD::SHL handling.

As mentioned by @nikic on rGef5debac4302, we can merge the guaranteed bottom zero bits from the shifted value, and then, if a min shift amount is known, zero out the bottom bits as well.
parent bad6032b
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