[PATCH, BINUTILS, AARCH64, 1/9] Add -march=armv8.5-a and related internal feature macros

[Sudakshina Das]

Hi

This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/exploration-tools)

This is the first of the patch series and adds -march=armv8.5-a and
other internal feature marcos needed for it.

Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu
and aarch64-none-elf.

Ok for trunk?

Thanks
Sudi
Ps. I do not have commit access so if OK can someone apply for me?


*** gas/ChangeLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* config/tc-aarch64.c (aarch64_archs): New entry for armv8.5-a.
	* doc/c-aarch64.texi: Add documentation for the same.

*** include/ChnageLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* opcode/aarch64.h (AARCH64_FEATURE_V8_5): New.
	(AARCH64_ARCH_V8_5): New.

*** opcodes/ChangeLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* aarch64-tbl.h (aarch64_feature_set aarch64_feature_v8_5): New.
	(ARMV8_5, V8_5_INSN): New.


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