[Webkit-unassigned] [Bug 171915] New: [JSC] Proxy's GetPrototypeOf does not invoked during access to __proto__ property

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171915

            Bug ID: 171915
           Summary: [JSC] Proxy's GetPrototypeOf does not invoked during
                    access to __proto__ property
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gskachkov at gmail.com

Also I found interesting behavior of proxy:
```
var target = {};
proxy = new Proxy(target, {
    getPrototypeOf(t) { console.log("get prototype:", t); return t.__proto__; } 
});
proxy.__proto__ === target.__proto__;
``` 
In Chrome & FireFox it prints:
// get prototype: ....
// Object ...
In jsc we do not print `get prototype: ....`, just `Object ...`

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