Noah Goldstein a98ee27416 [X86] Add TuningPreferShiftShuffle for when Shifts are preferable to shuffles.
SKX has an objectively faster shift than shuffle, on all other targets
the two have equal performance (with maybe a slight preference for
shifts because p5 is a more common bottleneck).

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D143786
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