aco/ngg: Clean up and reorganize NGG VS/TES code.

Make the NGG VS/TES code easier to follow, give better names to
some functions and make ngg_nogs_early_prim_export a variable.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6964>
3 files changed