dct: modified block copy used in dct8 with convert16to32 inline function
dct: manually inline convert16to32, for 10% improvement
intra-sse3.cpp: Created common macros PRED_INTRA_ANGLE_4_START, PRED_INTRA_ANGLE_4_END for PredIntraAng4_[ANGLE] function.
intra-sse3.cpp: Replace PredIntraAng4_26 vector class function with intrinsic using intrinsic macros PRED_INTRA_ANGLE_4_START and PRED_INTRA_ANGLE_4_END.
asm: fix bug in filterHorizontal_p_p_4 with width less than 8 (seed 0x52578C72)
asm: improvement filterHorizontal_p_p_4 by reorder intermedia data

1. repleace phaddw to paddw
2. use extra load operator to split data dependency and reduce table size
intra-sse3.cpp: Replace PredIntraAng4_21 vector class function with intrinsic.
dct: Replaced partialButterfly16 vector class function to intrinsic
dct: move dct8 to dct-sse41.cpp, inline convert16to32
intra-sse3.cpp: Replace PredIntraAng4_17 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_13 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_9 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_5 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_2 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_m_2 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_m_5 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_m_9 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_m_13 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_m_17 vector class function with intrinsic.
intra-sse3.cpp: Replace PredIntraAng4_m_21 vector class function with intrinsic.