[vector] AVX2 ByteVector.shiftR performance and semantics

[John Rose]

On Jul 24, 2019, at 2:34 PM, Richard Startin <richard at openkappa.co.uk> wrote:
> 
> I just built the API again from the vectorIntrinsics branch, and rewrote the code posted earlier in this chain as follows:

Thanks Richard!  After the last refactoring we had to fix some inlining problems.
I hope this is one more of the same.  We’ll take a look.  Thanks for the small test case.
— John