David Green b55d4c2ad8 Revert "[LV] Remove LoopVectorizationCostModel::useEmulatedMaskMemRefHack()" ...

This reverts commit 77a0da926c as we've
received multiple reports of this significantly impacting performance,
in ways that don't seem to just be target specific cost models going
wrong. I would offer some reproducers, but the test changes here seem to
be full of them!

Reverting for now and hopefully we can remove the "hack" more carefully
as we go.

2022-02-09 20:02:54 +00:00

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