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Avoid unnecessary chroma MC in SAD pre-selection for GPM-TM

Ruoyang Yu requested to merge ruoyangyu/ECM:gpmTM_encOpt into master

Avoid invoking unnecessary chroma motion compensation for all possible MVs in SAD pre-selection stage for GPM-TM. The chroma samples will anyway be generated for those selected MVs at a later stage but before entering the SSE-based RDO.

No impact on BD-rate results.

Had run some class D sequences under RA comparing to the master just to double-check.

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