arm64: cdef: NEON implementation of the dir function
Speedup vs C code:
Cortex A53 A72 A73
cdef_dir_8bpc_neon: 4.30 3.36 4.21
Speedup vs C code:
Cortex A53 A72 A73
cdef_dir_8bpc_neon: 4.30 3.36 4.21
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