Reland "Added AVX512 support for SkRasterPipeline_opts.h"

This is a reland of commit ca883b068bad7475f5de62d1e4a8e5402fb3913f

Original change's description:
> Added AVX512 support for SkRasterPipeline_opts.h
>
> Change-Id: Ic7138faecd3887090288774373a89507da7fc87d
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/801296
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: John Stiles <johnstiles@google.com>
> Commit-Queue: John Stiles <johnstiles@google.com>

Change-Id: I9a855273c4fcb0c1114261a183080a9834efef69
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/803416
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
11 files changed