[9/16][binutils][AARCH64]Add relocation support for large memory model. [GAS]Add BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC support.

[Renlin Li]

Hi all,

This is a patch to add BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC to GAS.
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 gas regression test done without new failures. Okay to commit?

Regards,
Renlin

bfd/ChangeLog:

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

     * reloc.c (BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC): New entry.
     * elfnn-aarch64.c (elfNN_aarch64_howto_table): New entry for
     BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC.
     * libbfd.h: Regenerate.
     * bfd-in2.h: Likewise


gas/ChangeLog:

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

     * config/tc-aarch64.c (reloc_table): New relocation modifier 
tlsgd_g0_nc.
     (process_movw_reloc_info): Support BFD_RELOC_AARCH64_TLSGD_MOVW_G1.
     (md_apply_fix): Likewise.
     (aarch64_force_relocation): Likewise.

gas/testsuite/ChangeLog:

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

     * gas/aarch64/reloc-tlsgd_g0_nc.d: New.
     * gas/aarch64/reloc-tlsgd_g0_nc.s: New.
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