i965: Add INTEL_fragment_shader_ordering support.

Adds suppport for INTEL_fragment_shader_ordering. We achieve
the fragment ordering by using the same instruction as for
beginInvocationInterlockARB() which is by issuing a memory
fence via sendc.

Signed-off-by: Kevin Rogovin <kevin.rogovin@intel.com>
Reviewed-by: Plamena Manolova <plamena.manolova@intel.com>

src/intel/compiler/brw_fs_nir.cpp

@@ -4836,6 +4836,7 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
       break;
    }
 
+   case nir_intrinsic_begin_fragment_shader_ordering:
    case nir_intrinsic_begin_invocation_interlock: {
       const fs_builder ubld = bld.group(8, 0);
       const fs_reg tmp = ubld.vgrf(BRW_REGISTER_TYPE_UD, 2);