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memory reduction for sign prediction

Fabrice URBAN requested to merge (removed):sign_pred_mem_reduction into master

memory reduction for sign prediction Use 8-bit enum type instead of TCoeff (32-bit int) for coeffSigns buffers. The change is bit-accurate. Memory reduction is more than 500MB in classA. Encoding speed is also improved (about 1%) because the coeffSigns buffers are a quarter of the size.

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