[PATCH, ARM] Select appropriate memcpy implementation for ARMv8-a.

[Marcus Shawcroft]

The newlib configury logic that detects architecture version and chooses 
an appropriate memcpy implementation does not consider ARMv8-a.

This patch adds configury logic to detect ARMv8-a along with the 
associated changes in Makefile.am and memcpy.


2015-11-02  Marcus Shawcroft  <marcus.shawcroft@arm.com>

         * libc/machine/arm/configure.in: Check for __ARM_ARCH_8A__.
         * libc/machine/arm/memcpy.S: Handle __ARM_ARCH_8A__.
         * libc/machine/arm/Makefile.am: Consider HAVE_ARMV8A in memcpy
         selection.
         * libc/machine/arm/Makefile.in: Regenerate.
         * libc/machine/arm/configure: Regenerate.

OK?

Cheers
/Marcus
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