Philip Reames a25b537bf4 [SCEV] Infer known bits from known sign bits ...

This was suggested by lebedev.ri over on D96534.  You'll note lack of tests.  During review, we weren't actually able to find a case which exercises it, but both I and lebedev.ri feel it's a reasonable change, straight forward, and near free.

Differential Revision: https://reviews.llvm.org/D97064

2021-03-09 12:37:17 -08:00

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