redesigned SkSL interpreter vector instructions

Bug: skia:
Change-Id: I7737eacdb5acd6b19d95fce7ee76945f0f9d0d7e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214221
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
4 files changed