Add 4 Channel Shuffle Intrinsics#1404

Merged

JimBobSquarePants merged 9 commits intomasterfrom

js/shuffle-intrinsics

Oct 29, 2020

Commits on Oct 26, 2020

Commits on Oct 27, 2020

Add optimized fallback for existing shuffles.
JimBobSquarePants
committed

Commits on Oct 29, 2020

Fix benchmarks, cleanup.
JimBobSquarePants
committed