radv: use lower_shuffle_to_swizzle_amd

Affects a few shaders in Detroit: Become Human and Doom Eternal.

fossil-db (Navi):
Totals from 9 (0.01% of 135946) affected shaders:
CodeSize: 31188 -> 25096 (-19.53%)
Instrs: 6136 -> 4999 (-18.53%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5695>

src/amd/vulkan/radv_shader.c

@@ -531,6 +531,7 @@ radv_shader_compile_to_nir(struct radv_device *device,
 			.lower_vote_eq_to_ballot = 1,
 			.lower_quad_broadcast_dynamic = 1,
 			.lower_quad_broadcast_dynamic_to_const = gfx7minus,
+			.lower_shuffle_to_swizzle_amd = 1,
 		});
 
 	nir_lower_load_const_to_scalar(nir);