Import bionic's x86_64 optimized string routines

Add 'contrib/bionic-x86_64-string/' from commit 'd77520609f5240f5fad18fa1fd2275ac1de7cbb5'

git-subtree-dir: contrib/bionic-x86_64-string
git-subtree

Import bionic's x86_64 optimized string routines

Add 'contrib/bionic-x86_64-string/' from commit 'd77520609f5240f5fad18fa1fd2275ac1de7cbb5'

git-subtree-dir: contrib/bionic-x86_64-string
git-subtree-mainline: 715f82e4f5c51c04314904dee8090c8abbbe2156
git-subtree-split: d77520609f5240f5fad18fa1fd2275ac1de7cbb5

Requested by: mjg
Sponsored by: The FreeBSD Foundation

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