nvc0/ir: fix shared atomic lowering to preserve shared memory location

nvc0/ir: fix shared atomic lowering to preserve shared memory location

We were always doing atomics on shared memory location 0 instead of the
originally supplied location. Make sure to pass through the original
symbol and any indirection.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Cc: mesa-stable@lists.freedesktop.org # note: expect minor conflict