AAC encoder: encode out-of-phase I/S efficiently
Use the ability to invert phase with ms_mask instead of changing the codebook when possible, to avoid having to switch codebooks if some bands are INTENSTY_BT and others are INTENSITY_BT2, since usually a set ms_mask uses less bits that a codebook change. While it may not always be a win (ie: if it causes an ms_mask bitmap to be sent when it wouldn't have been otherwise), it's unlikely since the ms_mask bitmap will almost always be there already for M/S itself.
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