Submitted by: Ard Biesheuvel.

sha/asm/sha256-armv4.pl: add ARMv8 code path.

+5% on Atom Silvermont, up to +8% improvement of legacy code.
Harmonize sha1-586.pl and aesni-sha1-x86_86.p with sha1-x86_64.pl.

(and shave off cycle even from integer-only code)

(and update performance data, and fix typo)

(and ensure stack alignment in the process)

SHA512_Transform was initially added rather as tribute to tradition
than for practucal reasons. But use was recently found in ssl/s3_cbc.c
and it turned to be problematic on platforms that don't tolerate
misasligned references to memory and lack assembly subroutine.

PR: 3165

Submitted by: Marcelo Cerri

sha/asm/sha512-ppc.pl: add little-endian support.

Submitted by: Marcelo Cerri

Submitted by: Marcelo Cerri

Suggested by: Anton Blanchard

Latest MIPS ISA specification declared 'branch likely' instructions
obsolete. To makes code future-proof replace them with equivalent.

Submitted by: Gisle Vanem

PR: 3074

(and pending AVX2 changes).

PR: 2963 and a number of others