fixed: <rdar://problem/4166838> failed assertion in`Interpreter::lockCount() > 0

	no layout test added; this is in the bindings code.

        * bindings/objc/WebScriptObject.mm:
        (+[WebScriptObject _convertValueToObjcValue:KJS::originExecutionContext:Bindings::executionContext:Bindings::]): make sure to lock and unlock the interpreter around allocations.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@9549 268f45cc-cd09-0410-ab3c-d52691b4dbfc