sha/asm/keccak1600-avx2.pl: optimized remodelled version.
New register usage pattern allows to achieve sligtly better
performance. Not as much as I hoped for. Performance is believed
to be limited by irreconcilable write-back conflicts, rather than
lack of computational resources or data dependencies.
Reviewed-by:
Rich Salz <rsalz@openssl.org>
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