Don't set %rcx twice before "rep movsb"
* sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S (MEMCPY): Don't set %rcx twice before "rep movsb".
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* sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S (MEMCPY): Don't set %rcx twice before "rep movsb".