[2/16][binutils][AARCH64]Add relocation support for large memory model. [LD]Add BFD_RELOC_AARCH64_LD64_GOTOFF_LO15 Support.

[Renlin Li]

Hi all,

This patch adds LD support for BFD_RELOC_AARCH64_LD64_GOTOFF_LO15 
relocation. This is used in large memory model.

A dedicated register (gp) is used to hold GOT start address. And the 
offset into the GOT is represented by this symbol. The final address of 
symbol is the add result of the offset and gp.

ld regression test done without issues. Okay to commit?

bfd/ChangeLog:

2015-09-08  Renlin Li  <renlin.li@arm.com>

     * elfnn-aarch64.c (aarch64_reloc_got_type): Add
         BFD_RELOC_AARCH64_LD_64_GOTOFF_LO15 support.
     (elfNN_aarch64_gc_sweep_hook): Likewise.
     (elfNN_aarch64_check_relocs): Likewise
     * elfxx-aarch64.c (_bfd_aarch64_elf_put_addend): Likewise.
     (_bfd_aarch64_elf_resolve_relocation): Likewise
     (elfNN_aarch64_final_link_relocate): Calculate offset within GOT.


ld/testsuite/ChangeLog:

2015-09-08  Renlin Li  <renlin.li@arm.com>

     * ld-aarch64/emit-relocs-310.d: New.
     * ld-aarch64/emit-relocs-310.s: New.
     * ld-aarch64/aarch64-elf.exp: Run the test.
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