Import optimized memcpy/memset/memcmp routines

Import AArch64 optimized routines for memcpy, memset and memcmp from
https://github.com/ARM-software/optimized-routines
4 files changed
tree: e921471283bc59b262bced43e61cc734f7828726
  1. src/
  2. .gitignore
  3. Cargo.toml