close out simple assembler TODO

This should be the same amount of work in Assembler::bytes()
with one fewer field to track... might as well!

Change-Id: I54ca919983f11d218255817dbc4db292e7972409
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/356796
Auto-Submit: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Herb Derby <herb@google.com>
2 files changed