MangoPi MQ Pro (Allwinner D1, C906) memcpy benchmark

Implements the void *memcpy(void *dest, const void *src, size_t n) standard library function.

• rvv: reference implementation
• rvv_align_dest: aligns the destination pointer to vlenb
• rvv_align_src: aligns the source pointer to vlenb
• rvv_align_dest_hybrid: aligns the destination pointer to vlenb, but uses the basic rvv implementation for smaller inputs
• rvv_tail: uses manual tail handling, to avoid calling vsetvl in the loop
• rvv_128: like rvv_tail, but uses a fixed vlenb=128/8 for every LMUL

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