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[KnownBits] Combine abs() implementations

Authored by nikic on Fri, Nov 13, 1:17 PM.

Description

[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.

Details

Committed
nikicFri, Nov 13, 1:23 PM
Parents
rGa2f2c2f3a463: Serialization: Merge three diagnostics to simplify ASTReader::getInputFile, NFC
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