AArch64 compiler intrinsics

This crate provides implementations of compiler intrinsics such as memcpy and memset, using optimized ARM assembly. These will supersede the generic Rust versions at link time.

The optimized routines are taken from the (ARM optimized-routines GitHub repo)[https://github.com/ARM-software/optimized-routines].

Declare using extern crate aarch64_intrinsics; in the crate root to pull it into a build.