x86, mem: memcpy_64.S: Optimize memcpy by enhanced REP MOVSB/STOSB
Support memcpy() with enhanced rep movsb. On processors supporting enhanced rep movsb, the alternative memcpy() function using enhanced rep movsb overrides the original function and the fast string function. Signed-off-by: NFenghua Yu <fenghua.yu@intel.com> Link: http://lkml.kernel.org/r/1305671358-14478-8-git-send-email-fenghua.yu@intel.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
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