anv: Perform rasterizer discard in the SOL stage instead of the clipper.

See commit b0629e6894513a2c49a018bc3342a4e55435a236, where we discovered
that the SOL stage's "Rendering Disable" feature is a lot faster at
throwing away all geometry than the clipper's "reject all" mode.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
4 files changed