avcodec/vc1_block: Optimize vc1_decode_i_block_adv()
9127 -> 8936 decicycles (fate-suite/vc1/SA10143.vc1)
13855 -> 10976 decicycles (fate-suite/vc1/SA20021.vc1)
tests done by the author over this function but with the whole
patchset applied not just this commit
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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