[Webkit-unassigned] [Bug 193513] New: [JSC] ToThis omission in DFGByteCodeParser is wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193513

            Bug ID: 193513
           Summary: [JSC] ToThis omission in DFGByteCodeParser is wrong
           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: yusukesuzuki at slowstart.org

It assumes that `ToThis(ToThis(value)) === ToThis(value)`. But it is wrong since the semantics of ToThis in strict mode and ToThis in sloppy mode is different.
If `ToThisFromSloppyMode(ToThisFromStrictMode(value))` is converted to `ToThisFromStrictMode(value)`, we have a bad time!

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