[Webkit-unassigned] [Bug 257774] New: __proto__ produce oldvalue after Object.prototype.__proto__ changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257774

            Bug ID: 257774
           Summary: __proto__ produce oldvalue after
                    Object.prototype.__proto__ changes
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: q602706150 at gmail.com

WebKit git commit:
fa67a26252252fec5d3f124b05398ce812cfdffc

run args:
./jsc --useConcurrentJIT=0 --jitPolicyScale=0.1 test.js

```
function opt(){
   return Uint8Array.__proto__
}
noDFG(opt)

function test() {    
    for(let i=0;i<100;i++)
        opt()
    Object.defineProperty(Object.prototype, "__proto__", {
        "get": function () { return "xxx" }
    })
    print(opt() == Uint8Array.__proto__)
}
noDFG(test)
test()
```

The test case should print `true`, however it prints `false`. Is this a bug about InlineCache?

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