This allows authors as well as reviewers to avoid wasting CPU cycles on
changes which require revision or won't be accepted.

Change-Id: I57946609462149d29229b613d0a4c68a21ccb154
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46548
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>