[PATCH 9/10, GAS/ARM] Add linker support for ARMv8-R

[Thomas Preudhomme]

Hi,

=== Context ===

This patch is part of a patch series to add support for ARMv8-R
architecture. Its purpose is to add support for ARMv8-R in the linker.

=== Patch description ===

This patch is composed of 3 changes:

1) The main change is the addition of the logic for merging a file whose
Tag_CPU_arch build attribute is 15 (ARMv8-R). Namely, all pre-ARMv8 are
merged into ARMv8-R as well as ARMv8-R itself. ARMv8-A (14) merges into
ARMv8-A. ARMv8-M Baseline (16) and Mainline (17) are not allowed to
merge merge with ARMv8-R. Note that merging only occurs if the two
profiles are identical or one is S (Application or Realtime) and the
other is R.

2) using_thumb_only, using_thumb2_bl, using_thumb2 and arch_has_arm_nop
are updated according to capabilities of ARMv8-R and their BFD_ASSERT
updated to reflect that the logic is valid for ARMv8-R.

3) 2 build attribute merging tests are added to test the first change.

ChangeLog entries are as follow:

*** gas/ChangeLog ***

2017-01-27  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* bfd/elf32-arm.c (using_thumb_only): Update list of architectures in
	BFD_ASSERT for which the logic is valid.
	(using_thumb2_bl): Likewise.
	(using_thumb2): Likewise and return true for ARMv8-R.
	(arch_has_arm_nop): Likewise.
	(tag_cpu_arch_combine): New v8r table for ARMv8-R Tag_CPU_arch
	merging logic.  Update commentis for value 15 of v8m_baseline,
	v8m_mainline and v4t_plus_v6_m arrays.  Use v8r array to decide
	merging of value 15 of Tag_CPU_arch.
	* testsuite/ld-arm/arm-elf.exp (EABI attribute merging 11): New test.
	(EABI attribute merging 12): Likewise.
	* testsuite/ld-arm/attr-merge-11a.s: New file.
	* testsuite/ld-arm/attr-merge-11b.s: New file.
	* testsuite/ld-arm/attr-merge-11.attr: New file.
	* testsuite/ld-arm/attr-merge-12a.s: New file.
	* testsuite/ld-arm/attr-merge-12b.s: New file.
	* testsuite/ld-arm/attr-merge-12.attr: New file.

=== Testing ===

Testsuite shows no regression when run for arm-none-eabi targets.

Is this ok for master branch?

Best regards,

Thomas
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