Matt Arsenault 9d3e56e2ee DAG: Try scalarizing when expanding saturating add/sub ...

In an upcoming AMDGPU patch, the scalar cases will be legal and vector
ops should be scalarized, rather than producing a long sequence of
vector ops which will also need to be scalarized.

Use a lazy heuristic that seems to work and improves the thumb2 MVE
test.

2020-07-16 14:05:16 -04:00

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