This includes some new rasterization tests which may be interesting for
us

Change-Id: Ie1eacc45fc25298886eae43a5b48309e6ade067b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38988Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>