[AArch64] BFD Support BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15

[AArch64] BFD Support BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15

2015-06-01  Jiong Wang  <jiong.wang@arm.com>
bfd/
	* elfnn-aarch64.c (aarch64_reloc_got_type): Support
	BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15.
	(elfNN_aarch64_final_link_relocate): Ditto.
	(elfNN_aarch64_gc_swap_hook): Ditto.
	(elfNN_aarch64_check_relocs): Ditto.
	* elfxx-aarch64.c (_bfd_aarch64_elf_put_addend): Ditto.

ld/testsuite/
	* ld-aarch64/emit-relocs-313.s: New test file.
	* ld-aarch64/emit-relocs-313.d: Ditto.
	* ld-aarch64/aarch64-elf.exp: Run new test.