Imports of x86avxgen command

PathSynopsis
bytesPackage bytes implements functions for the manipulation of byte slices.
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go/formatPackage format implements standard formatting of Go source.
golang.org/x/arch/x86/xeddataPackage xeddata provides utilities to work with XED datafiles.
ioPackage io provides basic interfaces to I/O primitives.
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
regexpPackage regexp implements regular expression search.
sortPackage sort provides primitives for sorting slices and user-defined collections.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
text/templatePackage template implements data-driven templates for generating textual output.