asahi: Identify & disable triangle merging for shaders using derivatives

asahi: Identify & disable triangle merging for shaders using derivatives

It seems triangle merging is incompatible with calculating derivatives
along primitive edges correctly. Take the appropriate NIR shader info
flags in the compiler and pass them down as a flag to the driver, so it
can set the disable triangle merging flag (formerly called "lines or
points").

TODO: Is this what macOS does when you set a sample mask there (which
apparently fixes the same bug on the Darwinia Metal backend)? Do we
also need to set this when sample masks are used?

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Fixes Darwinia and dEQP2 projected tests.

Signed-off-by: Asahi Lina <lina@asahilina.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20365>