assert: fix AssertionError, assign error code

Using `assert.AssertionError()` without the `new` keyword results
in a non-intuitive error:

```js
> assert.AssertionError({})
TypeError: Cannot assign to read only property 'name' of function 'function ok(value, message) {
  if (!value) fail(value, true, message, '==', assert.ok);
}'
    at Function.AssertionError (assert.js:45:13)
    at repl:1:8
    at realRunInThisContextScript (vm.js:22:35)
    at sigintHandlersWrap (vm.js:98:12)
    at ContextifyScript.Script.runInThisContext (vm.js:24:12)
    at REPLServer.defaultEval (repl.js:346:29)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.onLine (repl.js:545:10)
    at emitOne (events.js:101:20)
>
```

The `assert.AssertionError()` can only be used correctly with `new`,
so this converts it into a proper ES6 class that will give an
appropriate error message.

This also associates the appropriate internal/errors code with all
`assert.AssertionError` instances and updates the appropriate test
cases.

PR-URL: https://github.com/nodejs/node/pull/12651
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/test/message/error_exit.out b/test/message/error_exit.out
index c1b778d6e9..f6ac80794b 100644
--- a/test/message/error_exit.out
+++ b/test/message/error_exit.out
@@ -1,9 +1,9 @@
 Exiting with code=1
-
 assert.js:*
-  throw new assert.AssertionError({
+  throw new AssertionError({
   ^
-AssertionError: 1 === 2
+
+AssertionError [ERR_ASSERTION]: 1 === 2
     at Object.<anonymous> (*test*message*error_exit.js:*:*)
     at Module._compile (module.js:*:*)
     at Object.Module._extensions..js (module.js:*:*)