i965: Upload separate per-stage sampler state tables.

i965: Upload separate per-stage sampler state tables.

Also upload separate sampler default/texture border color entries.

At the moment, this is completely idiotic: both tables contain exactly
the same contents, so we're simply wasting batch space and CPU time.

However, soon we'll only upload data for textures actually /used/ in
a particular stage, which will usually make the VS table empty and
very likely eliminate all redundancy.  This is just a stepping stone.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>