Function assertNotNull

deps/v8/test/intl/assert.js:138–142

* Throws if value is null.

(value, user_message = '')

 * Throws if value is null.
 */
function assertNotNull(value, user_message = '') {
  if (value === null) {
    fail("not null", value, user_message);
  }
}

/**
 * Throws if value is undefined.