Relinked class prototype: instanceof, typeof super.m and the __proto__ setter still use the declared chain

[proggeramlug]

These are still wrong after #11764 (which fixes member reads, in, calls and super.m() after Object.setPrototypeOf(C.prototype, X)):

class B { m() { return 1; } }
class C extends B { t() { return typeof super.m; } }
const inst = new C();
Object.setPrototypeOf(C.prototype, { k: 7 });
console.log(inst instanceof B);   // node: false   perry: true
console.log(inst.t());            // node: undefined   perry: function

class D extends B {}
(D.prototype as any).__proto__ = { k: 7 };
console.log(Object.getPrototypeOf(D.prototype) === B.prototype);   // node: false   perry: true (no relink happens)

• instanceof: goes through class_chain_reaches, whose ~20 callers all walk the declared parent chain (get_parent_class_id). It should walk the instance's live [[Prototype]] chain when a class prototype on the way was relinked.
• typeof super.m / super property reads: resolved at compile time. A guarded runtime fallback needs the home class id, which no existing runtime entry point takes.
• C.prototype.__proto__ = X: the __proto__ setter on a class prototype doesn't relink at all, on main or with Drop the old parent's members from a relinked class chain #11764.

Related: #11760 (super.m() ignores a patched parent prototype without a relink).