vkd3d-shader/spirv: Implement support for stencil export.

Based on a vkd3d-proton patch by Philip Rebohle.

Signed-off-by: Conor McCarthy <cmccarthy@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

libs/vkd3d-shader/trace.c

@@ -1027,6 +1027,10 @@ static void shader_dump_register(struct vkd3d_d3d_asm_compiler *compiler, const
             shader_addline(buffer, "vGSInstanceID");
             break;
 
+        case VKD3DSPR_OUTSTENCILREF:
+            shader_addline(buffer, "oStencilRef");
+            break;
+
         default:
             shader_addline(buffer, "<unhandled_rtype(%#x)>", reg->type);
             break;