Nikita Popov bcfa0f592f [InstCombine] Move negation handling into freelyNegateValue() ...

Followup to D72978. This moves existing negation handling in
InstCombine into freelyNegateValue(), which make it composable.
In particular, root negations of div/zext/sext/ashr/lshr/sub can
now always be performed through a shl/trunc as well.

Differential Revision: https://reviews.llvm.org/D73288

2020-01-27 20:46:23 +01:00

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