Add accelerated arm64 sha512 to libmd

As with sha256 add support for accelerated sha512 support to libmd on
arm64. This depends on clang 13+ to build as this is the first release
with the needed int

Add accelerated arm64 sha512 to libmd

As with sha256 add support for accelerated sha512 support to libmd on
arm64. This depends on clang 13+ to build as this is the first release
with the needed intrinsics. Gcc should also support them, however from
a currently unknown release.

Reviewed by: cem
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33373

(cherry picked from commit 71bf1c4cc5b21e7e5740514c1bc6ad751f312eea)

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libmd: Only define SHA256_Transform_c when using the ARM64 ifunc.

GCC 9 doesn't define a SHA256_Transform symbol when the stub just wraps
SHA256_Transform_c resulting in an undefined symbol for
_lib

libmd: Only define SHA256_Transform_c when using the ARM64 ifunc.

GCC 9 doesn't define a SHA256_Transform symbol when the stub just wraps
SHA256_Transform_c resulting in an undefined symbol for
_libmd_SHA256_Transform in libmd.so.

Discussed with: andrew, jrtc27
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D31945

(cherry picked from commit a6765c4b449d79c6ee24dd7c37deb2239f6281a4)

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Use arm64 sha256 intrinsics in libmd

Summary:
When running on a CPU that supports the arm64 sha256 intrinsics use them
to improve perfromance of sha256 calculations.

With this changethe following i

Use arm64 sha256 intrinsics in libmd

Summary:
When running on a CPU that supports the arm64 sha256 intrinsics use them
to improve perfromance of sha256 calculations.

With this changethe following improvement has been seen on an Apple M1
with FreeBS running under Parallels, with similar results on a
Neoverse-N1 r3p1.

x sha256.orig
+ sha256.arm64
+--------------------------------------------------------------------+
|++ x x|
|+++ xxx|
||A |A||
+--------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 5 3.41 3.5 3.46 3.458 0.042661458
+ 5 0.47 0.54 0.5 0.504 0.027018512
Difference at 95.0% confidence
-2.954 +/- 0.0520768
-85.4251% +/- 0.826831%
(Student's t, pooled s = 0.0357071)

Reviewed by: cem
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31284

(cherry picked from commit 69d8dc20be6ca10cf87c98223121c4121aff42cc)

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