[PATCH, binutils/ARM] Fix ld --gc-section segfault with ARMv8-M Security Extensions entry function in absolute section

[Nick Clifton]

Hi Thomas,

> *** bfd/ChangeLog ***
> 
> 2016-09-02  Thomas Preud'homme  <thomas.preudhomme@arm.com>
> 
>         * elf32-arm.c (elf32_arm_gc_mark_extra_sections): Only mark section
>         not already marked.
> 
> 
> *** ld/ChangeLog ***
> 
> 2016-09-02  Thomas Preud'homme  <thomas.preudhomme@arm.com>
> 
>         * testsuite/ld-arm/cmse-veneers.s: Add a test for ARMv8-M Security
>         Extensions entry functions in absolute section.
>         * testsuite/ld-arm/cmse-veneers.rd: Adapt expected output accordingly.

Approved for mainline - please apply.

Cheers
  Nick