[Webkit-unassigned] [Bug 145738] New: Deleteting static function twice revives property with undefined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145738

            Bug ID: 145738
           Summary: Deleteting static function twice revives property with
                    undefined
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

RegExp.prototype.hasOwnProperty('exec');  // true
delete RegExp.prototype.exec;  // true
RegExp.prototype.hasOwnProperty('exec');  // false
delete RegExp.prototype.exec;  // true
RegExp.prototype.hasOwnProperty('exec');  // true ???

This is because JSObject::deleteProperty set undefine by `putEntry` if `isValidOffset(...)` is false (deleted).

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