fixed SPIR-V matrix operations

Bug: skia:
Change-Id: I23be824cdd7d00ffd0c54516a168c07e77bb4f49
Reviewed-on: https://skia-review.googlesource.com/140182
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed