Commit 9a85643c authored by Nikita Popov's avatar Nikita Popov
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[KnownBits] Combine abs() implementations 

ValueTracking was using a more powerful abs() implementation. Roll
it into KnownBits::abs(). Also add an exhaustive test for abs(),
in both the poisoning and non-poisoning variants.
parent a2f2c2f3
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