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Reapply "[LV] Enable vectorization of loops with conditional stores by default"

Description

Reapply "[LV] Enable vectorization of loops with conditional stores by default"

This patch reapplies r289863. The original patch was reverted because it
exposed a bug causing the loop vectorizer to crash in the Python runtime on
PPC. The underlying issue was fixed with r289958.

Details

Committed
mssimpsoDec 16 2016, 11:12 AM
Parents
rL289974: Implement LaneBitmask::any(), use it to replace !none(), NFCI
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