[GLIBC][AARCH64]Rewrite elf_machine_load_address using _DYNAMIC symbol

[Szabolcs Nagy]

On 08/11/16 21:28, Roland McGrath wrote:
> Show me the code you have in mind using _DYNAMIC.  The scheme using a
> linker-defined symbol with value 0 is the only one I'm aware of that
> reduces to the minimal number of assembly instructions, with none of them
> being a load.

well the current x86_64 code is already doing what i had in mind.

i assumed GOT[0] is used elsewhere so it has to be computed anyway
and then doing (_DYNAMIC-GOT[0]) should be the same as _BASE using
an extra sub.