switched over to using fallthrough in SkSL interpreter vector operations

Bug: skia:
Change-Id: Ibcbad9252f2da468549792bf7c3bb4e9a5b77805
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214380
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed