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CU/PU memory optimization

Xiang Li requested to merge XiangLi/VVCSoftware_VTM:xlxiangli/opt_cupu into master

In JVET-AF0156, CU/PU memory usage reduction (ECM!517, ECM!518) showed big decoding time reduction, which was claimed as a result of less memory copy at block level. In this MR, the same idea is tried for decoding time saving. But from the results so far, the decoding time saving is 1-4%, which is much less than the saving reported for ECM. It may be due to the fact that the amount of CU/PU level memory copy in the current VTM is much less than that in ECM.

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