(Hevc): Few Optimizations.
(Hevc/Sao): Removing if from loops.
(Hevc/Sao): Removing one test inside a for loop.
(Hevc/Sao): Removing tiles and slice code from the critical loop.
(Hevc/Sao): Clean up and remove test in critical loop.
(Hevc/Sao): Removing useless computation.
(Hevc/Sao): Clean up.
(Hevc/Sao): Refactoring saoFilterEdgeLuma_Horiz.
(Hevc/Sao): Refactoring saoFilterEdgeChroma_Diag.
(Hevc/Sao): Refactoring.