Port improvements from the hi token functions to the rest of the symbol
adaption functions. These weren't originally ported since they didn't
work with arbitrary padding. In practice, zero padding is already used
and only the tests need to be updated.
Results - Neoverse N1
Old:
msac_decode_symbol_adapt4_c: 41.4 ( 1.00x)
msac_decode_symbol_adapt4_neon: 31.0 ( 1.34x)
msac_decode_symbol_adapt8_c: 54.5 ( 1.00x)
msac_decode_symbol_adapt8_neon: 32.2 ( 1.69x)
msac_decode_symbol_adapt16_c: 85.6 ( 1.00x)
msac_decode_symbol_adapt16_neon: 37.5 ( 2.28x)
New:
msac_decode_symbol_adapt4_c: 41.5 ( 1.00x)
msac_decode_symbol_adapt4_neon: 27.7 ( 1.50x)
msac_decode_symbol_adapt8_c: 55.7 ( 1.00x)
msac_decode_symbol_adapt8_neon: 30.1 ( 1.85x)
msac_decode_symbol_adapt16_c: 82.4 ( 1.00x)
msac_decode_symbol_adapt16_neon: 35.2 ( 2.34x)
Kyle Siefring
37d52435d1