[AArch64][2.25 Backport] Improve PC-relative relocation check for shared library

[Tristan Gingold]

> On 29 Apr 2015, at 14:32, Jiong Wang <wong.kwongyuan.tools@gmail.com> wrote:
> 
> 2015-04-24 17:21 GMT+01:00 Nicholas Clifton <nickc@redhat.com>:
>> Hi Jiong,
>> 
>>> 2015-04-16  Jiong. Wang  <jiong.wang@arm.com>
>>> 
>>> bfd/
>>>   * elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Reject
>>>   PC-relative relocation for external symbol.
>>> 
>>> 
>>> ld/testsuite/
>>>   * ld-aarch64/pcrel.s: New testcase.
>>>   * ld-aarch64/pcrel_pic_defiend_local.d: New expect file.
>>>   * ld-aarch64/pcrel_pic_undefined.d: Ditto.
>>>   * ld-aarch64/aarch64-elf.exp: Run them.
>> 
>> 
>> Approved - please apply.
> 
> This patch cleanly applied to 2.25, OK to backport?

Just in case of misunderstanding: the branch 2.25 is the last release branch,
not the trunk.

It is ok to backport your patch to the 2.25 branch.

Tristan.