[ARM] Add support for ARMv8.1 command line option.

[Matthew Wahab]

ARMv8.1 is a set of optional architectural extensions to ARMv8. Support for the
individual extensions, added by other patches, is enabled by adding the
extension name to the "armv8-a" architecture name.  This patch adds support for
using "armv8.1-a" as an architecture name in its own right, making it the same
as "armv8-a" with all ARMv8.1 extensions enabled.

This patch depends on the ARMv8.1 patches submitted earlier:
- PAN extension: https://sourceware.org/ml/binutils/2015-05/msg00209.html
- Adv.SIMD extensions: https://sourceware.org/ml/binutils/2015-05/msg00211.html

Tested with check-binutils and check-gas for arm-none-linux-gnueabihf.

Ok for trunk?
Matthew

gas/
2015-05-21  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-arm.c (arm_archs): Add "armv8.1-a".
	* doc/c-arm.texi (ARM Options, -march): Add "armv8.1-a".

include/opcode
2015-05-21  Matthew Wahab  <matthew.wahab@arm.com>

	* arm.h (FPU_ARCH_CRYPTO_NEON_VFP_ARMV8_1): New.
	(ARM_ARCH_V8_1A): New.
	(ARM_ARCH_V8_1A_FP): New.
	(ARM_ARCH_V8_1A_SIMD): New.
	(ARM_ARCH_V8_1A_CRYPTOV1): New.
	(ARM_FEATURE_CORE): New.
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