Decoding utilities for the prefixes, ModR/M, and SIB bytes
Array *one-byte-prefixes-group-code-info-ar* is used for the efficient
lookup of prefix group code information from the one-byte opcode map; see
legacy-prefixes-decoding and opcode-maps.
See mandatory-prefixes-computation and instructions-with-mandatory-prefixes for details.
Arrays are created for the efficient lookup of modr/m-related information
from the opcode maps. See ModR/M-decoding.
See SIB-decoding for details.