fixed SkSL SPIR-V vector comparisons

Bug: skia:
Change-Id: I57788fe427f62e20c6e073fd96279910febef22e
Reviewed-on: https://skia-review.googlesource.com/114367
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed