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optimization of RdCost::getWeightedMSE() in case of constant weight

Fabrice URBAN requested to merge (removed):RdCost_weigted_SSE_optimization_and_cleanings into master

On top of !2760 (merged), removed in-loop condition and use non-weighted SSE function (with SIMD) when weight is constant. optimization of RdCost::getWeightedMSE(). Although this should be an optimization, tests on first intra period of CTC RA for classes B, C and D gives encoding time within cluster noise (99.8%)

Edited by Fabrice URBAN

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