AArch64: Add SVE memcpy
Add an initial SVE memcpy implementation. Copies up to 32 bytes use SVE vectors which improves the random memcpy benchmark significantly. Cleanup the memcpy and memmove ifunc selectors.
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Add an initial SVE memcpy implementation. Copies up to 32 bytes use SVE vectors which improves the random memcpy benchmark significantly. Cleanup the memcpy and memmove ifunc selectors.