radv: set export_clip_dists for the GS copy shader

This is needed for the next change to correctly compute the VS
output parameters from the shader info pass.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13119>

src/amd/compiler/aco_instruction_selection_setup.cpp

@@ -1032,7 +1032,9 @@ setup_isel_context(Program* program, unsigned shader_count, struct nir_shader* c
    unsigned scratch_size = 0;
    if (program->stage == gs_copy_vs) {
       assert(shader_count == 1);
-      setup_vs_output_info(&ctx, shaders[0], false, true, &args->shader_info->vs.outinfo);
+      setup_vs_output_info(&ctx, shaders[0], false,
+                           args->shader_info->vs.outinfo.export_clip_dists,
+                           &args->shader_info->vs.outinfo);
    } else {
       for (unsigned i = 0; i < shader_count; i++) {
          nir_shader* nir = shaders[i];