[Bug string/18858] _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18858

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Carlos O'Donell from comment #5)
> > 
> > Did we have inline mempcpy performance measurements on Intel machines when
> > the change was made?
> 
> Yes, Ondrej ran some numbers:
> https://sourceware.org/ml/libc-alpha/2015-05/msg00575.html

The data is for memcpy performance.  There is no __mempcpy_sse2_unaligned.
I will __mempcpy_sse2_unaligned to memcpy-sse2-unaligned.S:

ENTRY (__mempcpy_sse2_unaligned)
        mov     %rdi, %rax
        add     %rdx, %rax
        jmp     L(start)
END (__mempcpy_sse2_unaligned)

ENTRY(__memcpy_sse2_unaligned)
        movq    %rdi, %rax
L(start):

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