Avoid switching between scalar and SIMD in Affine_vpts.

This might avoid a scenario where math works out differently
between skvx and scalar.

Change-Id: I51cbd942aea4167d41ae1c1f4fc8985297e8068a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/649530
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Rakshit Sharma <sharaks@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
1 file changed