Fix async and generator function tags in REPL output

[lightmare]

Previously all kinds of functions were printed as [Function: name]

This PR differentiates:
[AsyncFunction: name]
[AsyncGeneratorFunction: name]
[GeneratorFunction: name]

In the second commit I changed the getObjectTag helper function a bit. Seemed strange that it didn't return toStringTag right away, but checked constructor.name as well and used the latter if found. Or is it actually supposed to prioritize constructor.name? In that case, it'd make sense to simply swap the two try blocks.

[ExE-Boss]

See also

• Rewrite inspect(…) function to return values closer to Node.js #117

[lightmare]

Thanks for the context. So both constructor.name and toStringTag should show up if they differ, right?

// Node.js v16.8.0.
> f = x => x
[Function: f]
> Object.defineProperty(f, Symbol.toStringTag, { value: 'g' })
[Function: f] [g]

[lightmare]

Pushed a fix for non-matching constructor.name and toStringTag, which I originally broke.

Main (before this PR):

> Object.defineProperty(x => x, Symbol.toStringTag, { value: 'barrow' });
[Function]
> Object.defineProperty(async x => x, Symbol.toStringTag, { value: 'aarrow' });
[Function]
> Object.defineProperty(function*foo() {}, Symbol.toStringTag, { value: 'gen' });
[Function: foo]
> Object.defineProperty(async function*foo() {}, Symbol.toStringTag, { value: 'agen' });
[Function: foo]
> Object.defineProperty({}, Symbol.toStringTag, { value: 'bar' });
{ }

This PR:

> Object.defineProperty(x => x, Symbol.toStringTag, { value: 'barrow' });
[Function (anonymous)] [barrow]
> Object.defineProperty(async x => x, Symbol.toStringTag, { value: 'aarrow' });
[AsyncFunction (anonymous)] [aarrow]
> Object.defineProperty(function*foo() {}, Symbol.toStringTag, { value: 'gen' });
[GeneratorFunction: foo] [gen]
> Object.defineProperty(async function*foo() {}, Symbol.toStringTag, { value: 'agen' });
[AsyncGeneratorFunction: foo] [agen]
> Object.defineProperty({}, Symbol.toStringTag, { value: 'bar' });
Object [bar] { }

Node.js:

> Object.defineProperty(x => x, Symbol.toStringTag, { value: 'barrow' });
[Function (anonymous)] [barrow]
> Object.defineProperty(async x => x, Symbol.toStringTag, { value: 'aarrow' });
[AsyncFunction (anonymous)] [aarrow]
> Object.defineProperty(function*foo() {}, Symbol.toStringTag, { value: 'gen' });
[GeneratorFunction: foo] [gen]
> Object.defineProperty(async function*foo() {}, Symbol.toStringTag, { value: 'agen' });
[AsyncGeneratorFunction: foo] [agen]
> Object.defineProperty({}, Symbol.toStringTag, { value: 'bar' });
Object [bar] {}