nir/spirv: Get rid of default GS info

shaderc has been fixed for a while now.

src/glsl/nir/spirv/spirv_to_nir.c

@@ -3674,12 +3674,6 @@ spirv_to_nir(const uint32_t *words, size_t word_count,
    b->values = rzalloc_array(b, struct vtn_value, value_id_bound);
    exec_list_make_empty(&b->functions);
 
-   /* XXX: We shouldn't need these defaults */
-   if (b->shader->stage == MESA_SHADER_GEOMETRY) {
-      b->shader->info.gs.vertices_in = 3;
-      b->shader->info.gs.output_primitive = 4; /* GL_TRIANGLES */
-   }
-
    /* Handle all the preamble instructions */
    words = vtn_foreach_instruction(b, words, word_end,
                                    vtn_handle_preamble_instruction);