swscale/ppc: VSX-optimize non-full-chroma yuv2rgb_2
./ffmpeg -f lavfi -i yuvtestsrc=duration=1:size=1200x1440 -sws_flags fast_bilinear \ -s 1200x720 -f null -vframes 100 -pix_fmt $i -nostats \ -cpuflags 0 -v error - 32-bit mul, power8 only. ~2x speedup: rgb24 24431 UNITS in yuv2packed2, 16384 runs, 0 skips 13783 UNITS in yuv2packed2, 16383 runs, 1 skips bgr24 24396 UNITS in yuv2packed2, 16384 runs, 0 skips 14059 UNITS in yuv2packed2, 16384 runs, 0 skips rgba 26815 UNITS in yuv2packed2, 16383 runs, 1 skips 12797 UNITS in yuv2packed2, 16383 runs, 1 skips bgra 27060 UNITS in yuv2packed2, 16384 runs, 0 skips 13138 UNITS in yuv2packed2, 16384 runs, 0 skips argb 26998 UNITS in yuv2packed2, 16384 runs, 0 skips 12728 UNITS in yuv2packed2, 16381 runs, 3 skips bgra 26651 UNITS in yuv2packed2, 16384 runs, 0 skips 13124 UNITS in yuv2packed2, 16384 runs, 0 skips This is a low speedup, but the x86 mmx version also gets only ~2x. The mmx version is also heavily inaccurate, while the vsx version has high accuracy.
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