[8/16][binutils][AARCH64]Add relocation support for large memory model. [LD]Add BFD_RELOC_AARCH64_TLSGD_MOVW_G1 support.

[Renlin Li]

Hi all,

This patch adds BFD_RELOC_AARCH64_TLSGD_MOVW_G1 support to binutils linker.
The following code sequence should be generated to access TLS variable 
in General Dynamic TLS Model.


     movz a0, #:tlsgd_g1:x             R_AARCH64_TLSGD_MOVW_G1
     movk a0, #:tlsgd_g0_nc:x       R_AARCH64_TLSGD_MOVW_G0_NC
     add  a0, gp, a0
     bl   __tls_get_addr                   R_AARCH64_CALL26
     nop

Binutils and ld regression test done without new failures. Okay to commit?

Regards,
Renlin

bfd/ChangeLog:

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

     * elfnn-aarch64.c (aarch64_reloc_got_type): Add
         BFD_RELOC_AARCH64_TLSGD_MOVW_G1 support.
     (elfNN_aarch64_final_link_relocate): Likewise.
     (elfNN_aarch64_relocate_section): Likewise.
     (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.

ld/testsuite/ChangeLog:

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

     * ld-aarch64/emit-relocs-515.d: New.
     * ld-aarch64/emit-relocs-515.s: New.
     * ld-aarch64/aarch64-elf.exp: Run new test.
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