\brief Dead code removal. Eliminate \e dead p-code ops This is a very fine grained algorithm, it detects usage of individual bits within the Varnode, not just use of the Varnode itself. Each Varnode has a \e consumed word, which indicates if a bit in the Varnode is being used, and it has two flags layed out as follows: - Varnode::lisconsume = varnode is in the working list - Varnode::vacconsume
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