Vikas Arora e0c809ad23 Move Entropy methods to lossless.c
Move all the Entropy evaluation methods to lossless.c (from histogram.c).
There's slight difference in the way entropy is computed for evaluating
entropy in prediction methods and histogram (literal) for huffman trees.
Plan (later) to merge few (static) methods and reduce the code size.

This change has no impact on the compression speed/density.

Change-Id: Ife3d96a3c4a8d78a91723d9e0a8d1b78c0256a15
2014-11-20 13:48:05 -08:00
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