Reject local-size qualifier of zero.

A zero-sized group on any axis would mean no work can be done.

Bug: b/299116275
Change-Id: Ib020fcf86bc8060bea885d25ad3ec41092d2094e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/751837
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Arman Uguray <armansito@google.com>
Reviewed-by: Arman Uguray <armansito@google.com>
3 files changed