More non-invertible shader local matrix guards

Change-Id: Ida9a300420ff1d883e617cdaadb80e88c99ad226
Reviewed-on: https://skia-review.googlesource.com/8333
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
4 files changed