x86/swr: replace sse4 instructions in pack_6ch with sse ones

There's no benefit from using blendps here except on CPUs with AVX, where
it's faster than shufps according to Intel's documentation.
As such, rename the sse4 functions to sse/sse2 and use shufps instead.

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
avcodec/aacdec: print extension type when startcode debugging is on

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/aacdec: Add table of profile names

based on tables of aac encoders from libavcodec

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