[GAS][AARCH64]Add BFD_RELOC_AARCH64_LD64_GOTOFF_LO15 Support

[Renlin Li]

Hi all,

This patch add BFD_RELOC_AARCH64_LD64_GOTOFF_LO15 support in Gas.

It's used in large memory model, GOT pic addressing.
The GOT size is limited to 28KiB in pic mode. So 15bit is enough to 
address all entries inside GOT

// gp = &_GOT_
         ldr     t0, [gp, #:gotoff_lo15:src]     // 
R_AARCH64_LD64_GOTOFF_LO15 src


Binutils and GAS tests Okay. Okay to commit?

Regards,
Renlin Li



bfd/ChangeLog:

2015-06-04  Renlin Li <renlin.li@arm.com>

     * reloc.c (BFD_RELOC_AARCH64_LD64_GOTOFF_LO15): New entry.
     * elfnn-aarch64.c (elfNN_aarch64_howto_table): New entry for
     BFD_RELOC_AARCH64_LD64_GOTOFF_LO15.
     * bfd-in2.h: Regenerate.
     * libbfd.h: Regenerate.

gas/ChangeLog:

2015-06-04  Renlin Li <renlin.li@arm.com>

     * config/tc-aarch64.c (reloc_table): New relocation modifier.
     (md_apply_fix): Support BFD_RELOC_AARCH64_LD64_GOTOFF_LO15.
     (aarch64_force_relocation): Ditto

gas/testsuite/ChangeLog:

2015-06-04  Renlin Li <renlin.li@arm.com>

     * gas/aarch64/reloc-insn.s: Update test
     * gas/aarch64/reloc-insn.d: Update expected result.
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