Moving the radix-2 to expose trivial twiddle factors
Silences unused parameter warning
Making exp_rotation1() use MAC16_16(), which saves a few cycles on ARM
Some cleaning up of the synthesis code.
Reduces decoder stack usage by only storing one channel of denormalized MDCT
Hack that makes the SMALL_FOOTPRINT CELT decoder use only 4.25 kB of stack.
Moves the remains of compute_inv_mdcts() to celt_synthesis()
Reduces the decoder stack use by removing the pcm_silk buffer in fixed-point

We only keep when concealing less than 10ms with SILK.
Cleaning up leftovers of "freq" in celt_decode_with_ec()