[GLIBC][AARCH64]Rewrite elf_machine_load_address using _DYNAMIC symbol

[Szabolcs Nagy]

On 18/10/17 11:32, Renlin Li wrote:
> Hi Szabolcs,
> 
> Here is the C version one which should be portable in all cases.
> aarch64 native glibc regression test checked Okay.
> 
> Regards,
> Renlin
> 
> ChangeLog:
> 
> 2017-10-18  Renlin Li  <renlin.li@arm.com>
> 
>     * sysdeps/aarch64/dl-machine.h (elf_machine_load_address): Use
>     _DYNAMIC symbol to calculate load address.
> 

This is OK to commit.