Fix #380: JVET-O1109 improvement

Merged Taoran Lu requested to merge tlu/VVCSoftware_VTM:o1109-improvement into master

Fix of #380:

Current implementation of O1109 (MR 648) is not general enough to support multiple slice/tile/brick case for lacking the boundary check and does not handle CTU size < 64 cases.

The improved implementation will be provided. There is no performance change on CTC testing cases where CTU size =128 and no multiple slice.

Edited by Taoran Lu

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