This is better than running potentially two different test lists for both.

Requires caching the parent test results with the testlist's hash as a cache key.

Change-Id: Ic153e65395fc1c3f02a66bbb1df60731ce28901b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26557Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>