Correct x86-64 memcpy/mempcpy multiarch selector

For x86-64 memcpy/mempcpy, we choose the best implementation by the
order:

1. __memcpy_avx_unaligned if AVX_Fast_Unaligned_Load bit is set.
2. __memcpy_sse2_unaligned if Fast_Unaligned_Load bit is set.
3. __memcpy_sse2 if SSSE3 isn't available.
4. __memcpy_ssse3_back if Fast_Copy_Backward bit it set.
5. __memcpy_ssse3

In libc.a and ld.so, we choose __memcpy_sse2_unaligned which is optimized
for current Intel and AMD x86-64 processors.

	[BZ #18880]
	* sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S: Moved to ...
	* sysdeps/x86_64/memcpy.S: Here.  Remove "#if !IS_IN (libc)".
	Add libc_hidden_builtin_def and versioned_symbol.
	(__memcpy_chk): New.
	(__memcpy_sse2_unaligned): Renamed to ...
	(memcpy): This.  Support USE_AS_MEMPCPY.
	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	mempcpy-sse2.
	* sysdeps/x86_64/memcpy.S: Moved to ...
	sysdeps/x86_64/multiarch/memcpy-sse2.S: Here.
	(__memcpy_chk): Renamed to ...
	(__memcpy_chk_sse2): This.
	(memcpy): Renamed to ...
	(__memcpy_sse2): This.
	* sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Properly
	select the best implementation.
	(ENTRY): Replace __memcpy_sse2 with __memcpy_sse2_unaligned.
	(END): Likewise.
	(libc_hidden_builtin_def): Likewise.
	(ENTRY_CHK): Replace __memcpy_chk_sse2 with
	__memcpy_chk_sse2_unaligned.
	(END_CHK): Likewise.
	* sysdeps/x86_64/multiarch/memcpy_chk.S (__memcpy_chk): Properly
	select the best implementation.
	* sysdeps/x86_64/multiarch/mempcpy.S (__mempcpy): Properly
	select the best implementation.
	(ENTRY): Replace __mempcpy_sse2 with __mempcpy_sse2_unaligned.
	(END): Likewise.
	(libc_hidden_def): Likewise.
	(libc_hidden_builtin_def): Likewise.
	(ENTRY_CHK): Replace __mempcpy_chk_sse2 with
	__mempcpy_chk_sse2_unaligned.
	(END_CHK): Likewise.
	* sysdeps/x86_64/multiarch/mempcpy_chk.S (__mempcpy_chk): Properly
	select the best implementation.

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