[PATCH][Binutils][AArch64] Fix regression in Cortex A53 erratum when PIE. (PR ld/23904)

[Nick Clifton]

Hi Tamar,

> Ok for master? and for backport to binutils-2.31?

> bfd/ChangeLog:
> 2018-11-23  Tamar Christina  <tamar.christina@arm.com>
> 
> 	PR ld/23904
> 	* elfnn-aarch64.c (_bfd_aarch64_adrp_p): Use existing constants.
> 	(_bfd_aarch64_erratum_843419_branch_to_stub): Use _bfd_aarch64_adrp_p.
> 	(struct erratum_835769_branch_to_stub_clear_data): New.
> 	(_bfd_aarch64_erratum_843419_clear_stub): New.
> 	(clear_erratum_843419_entry): New.
> 	(elfNN_aarch64_tls_relax): Use it.
> 	(elfNN_aarch64_relocate_section): Pass input_section.
> 	(aarch64_map_one_stub): Handle branch type none as valid.
> 
> ld/ChangeLog:
> 2018-11-23  Tamar Christina  <tamar.christina@arm.com>
> 
> 	PR ld/23904
> 	* testsuite/ld-aarch64/aarch64-elf.exp: Add erratum843419_tls_ie.
> 	* testsuite/ld-aarch64/erratum843419_tls_ie.d: New test.
> 	* testsuite/ld-aarch64/erratum843419_tls_ie.s: New test.

Approved for the mainline and for backporting.  Please apply.

Cheers
  Nick