`shuffle` will randomize the order in which the tests are run.
`limit` will run (post-shuffle) at most this number of tests.
 `no-results` will disable emission of the `results.json` file.

 These are useful for testing a random subset of the filtered test list.

Change-Id: Ied54b4fd57c9e02fa6a9e63b808417fdc8f73a43
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42710Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>