[Webkit-unassigned] [Bug 153816] New: JSSymbolTableObject::deleteProperty() crashes deleting Symbols

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153816

            Bug ID: 153816
           Summary: JSSymbolTableObject::deleteProperty() crashes deleting
                    Symbols
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: caitp at igalia.com

The following simple repro crashes on ToT, as well as in Safari 9:

```
var symbol = Symbol("");
window[symbol] = "crasher";
delete window[symbol]; // CRASH
```

Repro: https://jsfiddle.net/c820tLLt/

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