VC-1/WMV3 decoding: don't clear blocks unless they're actually used.
~8% faster VC-1 decoding.
Possible future optimization: clear blocks after use instead of before, and for
DC-only blocks, only clear the DC coefficient.
git-svn-id: svn://svn.ffmpeg.org/ffmpeg/trunk@19205 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
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