Checks that all the .wgsl test files actually compile with tint
Change-Id: Iea31f0f58fe0580fca55b07cf3b3ffc24cebcf9d
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/44870
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>