Verify that the given Varnode is produced by a straight line sequence of COPYs, INT_ADDs with a constant, from the base register marked as \e relative for our system. \param vn is the given Varnode \param typeCode will hold the base register code (if found) \param value will hold the additive value relative to the base register (if found) \return \b true if the Varnode is a \e relative constant
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