private VxtPtrInfo createVirtualOwnedVirtualVxtPtrInfo(VxtPtrInfo baseInfo)
			throws PdbException {
		Long accumOffset = baseInfo.accumOffset();
		Long baseOffset = baseOffsetById.get(baseInfo.baseId());
		if (baseOffset == null) {
			throw new PdbException("Cannot find base offset");
		}
		Long finalOffset = accumOffset + baseOffset;
		return new VxtPtrInfo(finalOffset, accumOffset, baseInfo.baseId(),
			updateParentage(baseInfo));
	}
Converts VxtPtrInfo from virtual-based-owned direct or indirect virtual base for this class
@param baseInfo the vxt info from the base
@return the new VxtPtrInfo for this class
@throws PdbException upon issue getting base offset
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/CppCompositeType.java