Craig Topper 243b7aaf51 [SelectionDAG] Use KnownBits::countMinSignBits() to simplify the end of ComputeNumSignBits.
This matches what is done in ValueTracking.cpp

Reviewed By: RKSimon, foad

Differential Revision: https://reviews.llvm.org/D116423
2021-12-31 17:29:57 -08:00
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