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Port CS mem reduction from ecm/ECM!525

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

Test results with RA classB are as follows. The anchor is the current master tip (VTM-22-31d07037). 4% memory saving (VmPeak) is observed, which is in line with the report in JVET-AF0156. More saving was report in JVET-AF0156 for class A.

Over VTM-22-31d07037
Y U V EncT DecT VmPeak
Class A1 #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class A2 #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class B 0.00% 0.00% 0.00% 100.4% 99.7% 96%
Class C #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class E
Overall (Ref) #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class D #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class F #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class TGM #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!
Class M #VALUE! #VALUE! #VALUE! #DIV/0! #DIV/0! #DIV/0!

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