nir: Fix number of indices on shared variable store intrinsics.

nir: Fix number of indices on shared variable store intrinsics.

Shared variables and input reworks landed around the same time.
Presumably, this was some sort of mistake in rebase conflict resolution.

This really only affects the num_indices field in nir_intrinsic_infos,
which is rarely used.  However, it's used by the printer.

Found by inspection.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>