Tighten up SkVM code a bit.

Change-Id: I0399eca880d1956ad5fdc465975880c4c8243d29
Bug: skia:12450
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/452321
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed