fixed byte/ubyte types in SPIR-V output

Bug: oss-fuzz:15313
Change-Id: Id694413b5c4de41b4e64ed45b732aaa4c52b5f1e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240198
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed