\brief Build input Varnodes by extracting SUBPIECEs from the root Extract different pieces from the given root based on the offsets and input data-types in \b dataTypePieces. \param rootVn is the given root Varnode \param followOp is the point at which the SUBPIECEs should be inserted (before) \param inVarnodes is the container for the new Varnodes
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