These routines make use of the rev8 instruction in the Zbb extension
to accelerate byte-swapping when OpenSSL is built specifically for
a machine that supports Zbb.
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu> Signed-off-by: Henry Brausen <henry.brausen@vrull.eu> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17640)