_mm256_blendv_epi8 needs avx2

Change-Id: Ib10215e1e5a86bf78cc34f9dca670417bb217b73
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/317271
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed