[PATCH, AARCH64] Optimized memmove

[Wilco Dijkstra]

This is an optimized memmove for AArch64. All copies of up to 96 bytes and all backward copies are
done by the new memcpy. The only remaining case is large forward copies which are done in the same
way as the memcpy loop, but copying from the end rather than the start. Speedup is similar as
memcpy.

ChangeLog:
2015-07-08  Wilco Dijkstra  <wdijkstr@arm.com>

	* newlib/libc/machine/aarch64/memove.S (memmove):
	Rewrite of optimized memmove.

OK for commit?
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