[PATCH][AArch64] Fix libc internal asm profiling code

[Marcus Shawcroft]

> On 8 Jul 2016, at 17:06, Szabolcs Nagy <Szabolcs.Nagy@arm.com> wrote:
> 
> 2016-07-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>
> 
> 	[BZ #18707]
> 	* sysdeps/aarch64/Makefile (CFLAGS-mcount.c): Add -mgeneral-regs-only.
> 	* sysdeps/aarch64/sysdep.h (CALL_MCOUNT): Save argument registers.

OK /Marcus