bionic/x86: Optimization for memcpy

Signed-off-by: Liubov Dmitrieva <liubov.dmitrieva@intel.com>
Signed-off-by: H.J. Lu <hongjiu.lu@intel.com>
Signed-off-by: Wei A Jin <wei.a.jin@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

Conflicts:

	libc/arch-x86/string/ssse3-memcpy5.S

Change-Id: I41e70d1d19d5457e65c89b64da452fbdaf3a00a7