[binutils-gdb] Fix ld --gc-section segfault with ARMv8-M entry function in absolute section

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 4f90d84b2f2995829d6af475077598d45ef1d127 ***

Author: Thomas Preud'homme <thomas.preudhomme@arm.com>
Branch: master
Commit: 4f90d84b2f2995829d6af475077598d45ef1d127

Fix ld --gc-section segfault with ARMv8-M entry function in absolute section

bfd/
2016-09-14  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* elf32-arm.c (elf32_arm_gc_mark_extra_sections): Only mark section
	not already marked.

ld/
2016-09-14  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.