nv50: fix stencil state

It's the front stencil methods that have contiguous offsets,
not the back ones.
Unfortunately the names in the header still have FRONT/BACK
reversed, so I'm using hex values until it gets updated.

src/gallium/drivers/nv50/nv50_state.c

@@ -409,35 +409,35 @@ nv50_depth_stencil_alpha_state_create(struct pipe_context *pipe,
 		so_data  (so, 0);
 	}
 
-	/*XXX: yes, I know they're backwards.. header needs fixing */
+	/* XXX: keep hex values until header is updated (names reversed) */
 	if (cso->stencil[0].enabled) {
-		so_method(so, tesla, NV50TCL_STENCIL_BACK_ENABLE, 5);
+		so_method(so, tesla, 0x1380, 8);
 		so_data  (so, 1);
 		so_data  (so, nvgl_stencil_op(cso->stencil[0].fail_op));
 		so_data  (so, nvgl_stencil_op(cso->stencil[0].zfail_op));
 		so_data  (so, nvgl_stencil_op(cso->stencil[0].zpass_op));
 		so_data  (so, nvgl_comparison_op(cso->stencil[0].func));
-		so_method(so, tesla, NV50TCL_STENCIL_BACK_FUNC_REF, 3);
 		so_data  (so, cso->stencil[0].ref_value);
 		so_data  (so, cso->stencil[0].writemask);
 		so_data  (so, cso->stencil[0].valuemask);
 	} else {
-		so_method(so, tesla, NV50TCL_STENCIL_BACK_ENABLE, 1);
+		so_method(so, tesla, 0x1380, 1);
 		so_data  (so, 0);
 	}
 
 	if (cso->stencil[1].enabled) {
-		so_method(so, tesla, NV50TCL_STENCIL_FRONT_ENABLE, 8);
+		so_method(so, tesla, 0x1594, 5);
 		so_data  (so, 1);
 		so_data  (so, nvgl_stencil_op(cso->stencil[1].fail_op));
 		so_data  (so, nvgl_stencil_op(cso->stencil[1].zfail_op));
 		so_data  (so, nvgl_stencil_op(cso->stencil[1].zpass_op));
 		so_data  (so, nvgl_comparison_op(cso->stencil[1].func));
+		so_method(so, tesla, 0x0f54, 3);
 		so_data  (so, cso->stencil[1].ref_value);
 		so_data  (so, cso->stencil[1].writemask);
 		so_data  (so, cso->stencil[1].valuemask);
 	} else {
-		so_method(so, tesla, NV50TCL_STENCIL_FRONT_ENABLE, 1);
+		so_method(so, tesla, 0x1594, 1);
 		so_data  (so, 0);
 	}