- S32x4Shuffle by decomposing into s-register moves if no patterns match.
- S16x8Shuffle, S8x16Shuffle implemented with vtbl if no patterns match.

LOG=N
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2856363003
Cr-Commit-Position: refs/heads/master@{#45210}