amd64 SIMD libc work has landed

Greetings!

I am happy to announce that the FreeBSD Foudation sponsored amd64 libc
SIMD enhancement work has landed in CURRENT following extensive testing.

Big thanks to all those who assisted in testing and reviewing the
changes, especially to mjg@ and kib@.

If there are any problems resulting from this changeset, please do not
hesitate to file a bug report.  You can disable SIMD-enhanced functions
at run time by setting the environment variable ARCHLEVEL to "scalar"
(using hand-written scalar assembly implementations instead) or at
compile time by building world WITHOUT_MACHDEP_OPTIMIZATIONS.

Please see simd(7) as well as the blog post:

    https://freebsdfoundation.org/blog/a-sneak-peek-simd-enhanced-string-functions-for-amd64/

for more details.

Yours,
Robert Clausecker

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