i965: Fix instanced geometry shaders on Gen8+.
Jordan added this in commit
741782b5948bb3d01d699f062a37513c2e73b076 for
Gen7 platforms. I missed this when adding the Broadwell code.
Fixes Piglit's spec/arb_gpu_shader5/invocation-id-{basic,in-separate-gs}
with MESA_EXTENSION_OVERRIDE=GL_ARB_gpu_shader5 set.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit
f9e5dc0a85df8dbfb8213ff772dfeb218972db12)