Simon Pilgrim c2d18d7005 [KnownBits] Add min/max shift amount handling to shl/lshr/ashr KnownBits helpers ...

Pulled out of the original D90479 patch - also includes the "impossible shift amount" filtering from computeKnownBitsFromShiftOperator.

Differential Revision: https://reviews.llvm.org/D90479

2021-03-08 11:44:31 +00:00

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