Not passing does not equal failing, and not failing does not equal passing, as there's the muddy waters of UNSUPPORTED and friends.

Check for transitions of [not failing -> failing] and [not passing -> passing] as reasons to say something.

Bug: b/137671242
Change-Id: Ibb612531da494738c411a1b3f1ac40a5c5078fdc
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/34188
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>