print SKVM test failures

Can sometimes be hard to know what's going on
on the bots without a little bit more debug help.

Change-Id: Ie556a8de88349170e9d9e44c16098223442838a2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/218316
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed