replace l3_unscale(1, exponents[pos]) by LUT
replace l3_unscale(1, exponents[pos]) by LUT


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@6082 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg