bool do_copy_propagation_elements(exec_list *instructions);
bool do_constant_propagation(exec_list *instructions);
void do_dead_builtin_varyings(struct gl_context *ctx,
bool do_copy_propagation_elements(exec_list *instructions);
bool do_constant_propagation(exec_list *instructions);
void do_dead_builtin_varyings(struct gl_context *ctx,