fixed constructing matrices in SPIR-V when arguments cross column boundaries

Bug: skia:
Change-Id: I20550c0ebf2c4ee225552b66f41ad9dc886d5fc3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/203161
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed