sse2 & ssse3 versions of dct_quantize.
core2: mmx2=154 sse2=73 ssse3=66 (cycles) k8: mmx2=179 sse2=149 p4: mmx2=284 sse2=194 Originally committed as revision 9003 to svn://svn.ffmpeg.org/ffmpeg/trunk
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core2: mmx2=154 sse2=73 ssse3=66 (cycles) k8: mmx2=179 sse2=149 p4: mmx2=284 sse2=194 Originally committed as revision 9003 to svn://svn.ffmpeg.org/ffmpeg/trunk