message: xdebug warning
diff: coro_global COROG;
  static coro_task* sw_get_current_task();
  static void sw_coro_func(void *);
  +static zend_bool is_xdebug_started = 0;
  #if PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 2
  static inline void sw_vm_stack_init(void)
  @@ -64,6 +65,10 @@ static inline void sw_vm_stack_init(void)
  int coro_init(TSRMLS_D)
  {
  + if (zend_get_module_started("xdebug") == SUCCESS)
  + {
  + is_xdebug_started = 1;
  + }
  COROG.origin_vm_stack = EG(vm_stack);
  COROG.origin_vm_stack_top = EG(vm_stack_top);
  COROG.origin_vm_stack_end = EG(vm_stack_end);
  @@ -187,11 +192,9 @@ static void sw_coro_func(void *arg)
  int sw_coro_create(zend_fcall_info_cache *fci_cache, zval **argv, int argc, zval *retval, void *post_callback,
  void *params)
  {
  - if (zend_get_module_started("xdebug") == SUCCESS)
  + if (is_xdebug_started == 1)
  {
  - swoole_php_fatal_error(E_ERROR,
  - "can not use xdebug in swoole coroutine, please remove xdebug in php.ini and retry.");
  - return 0;
  + swWarn("xdebug do not support coroutine, please notice that it lead to coredump.");
  }
  if (unlikely(COROG.coro_num >= COROG.max_coro_num) )
  