The main changes this brings in are:
- Improves the performance of memcmp
- Adds SVE implementation of memcpy
- Uses the MTE version of some str* functions as they are faster
Sponsored by: The FreeBSD Foundation
This is the new replacement for the existing cortex-strings code which will
be replaced in a follow-up commit.
We should also be able to use some of the math functions to allow the
tests to pass on AArch64 (and other architectures) instead of just x86.
We might also be able to reuse some of the tests for the kyua testsuite.
Imported using
```
curl -L e823e3abf5 | tar --strip-components=1 -xvzf -
git add .
```
Differential Revision: https://reviews.freebsd.org/D29035
git-subtree-dir: contrib/arm-optimized-routines
git-subtree-mainline: e34c713b0e
git-subtree-split: f9f37c002a
