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[LIBC] Add optimized memcpy routine for AArch64

Authored by avieira on Feb 3 2021, 1:28 AM.

Description

[LIBC] Add optimized memcpy routine for AArch64

This patch adds an optimized memcpy routine for AArch64 tuned and benchmarked
on Neoverse-N1.

Differential Revision: https://reviews.llvm.org/D92235

Details