Function assert

deps/v8/test/wasm-js/third_party/testharness.js:3435–3442

(expected_true, function_name, description, error, substitutions)

     * Utility functions
     */
    function assert(expected_true, function_name, description, error, substitutions)
    {
        if (expected_true !== true) {
            var msg = make_message(function_name, description,
                                   error, substitutions);
            throw new AssertionError(msg);
        }
    }

    function AssertionError(message)
    {