Interpreter: Support returns from runStriped

Change-Id: Id84c3fb35cb61fa839691471d03a44152964bedb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268941
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed