Jim Bankoski 3977e64fc7 don't dummy pack if we won't recode
Avoid packing the bitstream 2 times unless we need to.  For me this
at speed -5 was a 2% speed up.

Change-Id: I32205c98f55eedd4ff031ed5fb498c84bdaa855d
2014-01-15 15:30:13 -08:00
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