dfa: implement tdlt chunk decoding

Sample & pseudo code provided by Vladimir "VAG" Gneushev.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
x86: sbrdsp: implement SSE qmf_deint_bfly

From 312 to 89/68 (sse/sse2) cycles on Arrandale and Win64.
Sandybridge: 68/47 cycles.

Having a loop counter is a 7 cycle gain.
Unrolling is another 7 cycle gain.
Working in reverse scan is another 6 cycles.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>