hk: fix phi ordering

undefined argument order means phis are busted. fixes crash starting castle
crashers with an i386 gcc build of hk.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31532>

src/asahi/vulkan/hk_cmd_meta.c

@@ -587,8 +587,11 @@ build_image_copy_shader(const struct vk_meta_image_copy_key *key)
       nir_pop_if(b, NULL);
 
       if (key->block_based) {
-         nir_store_local_pixel_agx(b, nir_if_phi(b, value1, value2),
-                                   nir_imm_int(b, 1 << s), lid, .base = 0,
+         /* Must define the phi first so we validate. */
+         nir_def *phi = nir_if_phi(b, value1, value2);
+         nir_def *mask = nir_imm_int(b, 1 << s);
+
+         nir_store_local_pixel_agx(b, phi, mask, lid, .base = 0,
                                    .write_mask = 0xf, .format = isa_format,
                                    .explicit_coord = true);
       }