search: remove unnecessary set of cbf flags in xEstimateResidualQT()
quant.cpp: nits
search: remove redundant cbf flags setting in xEstimateResidualQT()
search: refactored xEstimateResidualQT() to remove cbf flag settings
weight_sp: pshufd to handle width 6 for SSE version of asm code

Backout of 2cb8cdaa7df5