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Commit d2502eb0 authored by Nikita Popov's avatar Nikita Popov
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[KnownBits] Add support for nuw/nsw on shifts 

Implement precise nuw/nsw support in the KnownBits implementation,
replacing the rather crude handling in ValueTracking.

Differential Revision: https://reviews.llvm.org/D151208
parent 660b3c85
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