David Green 59b56e5c57 [InstCombine] Expand usub_sat patterns to handle constants ...

The constants come through as add %x, -C, not a sub as would be
expected. They need some extra matchers to canonicalise them towards
usub_sat.

Differential Revision: https://reviews.llvm.org/D69514

2019-11-30 16:58:01 +00:00

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