This uses regres' test runner, without all the Gerrit functionality.
A faster, less frustrating version of dEQP's --deqp-caselist-file.

Kudos to paulthomson@ who did all the work here.

Change-Id: I1de26e731b197af64aeb60c79da0b75fe13cb338
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40529Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>