[ARM] Add ARMv8.2 architecture feature and command line option.

[Matthew Wahab]

Hello,

ARMv8.2 is an architectural extension of ARMv8. This patch adds an
architecture feature macro for ARMv8.2 to the binutils ARM target
with GAS command line option -march=armv8.2-a.

Tested arm-none-linux-gnueabihf with cross-compiled check-binutils and
check-gas. Checked the HTML documentation in Firefox.

Ok for trunk?
Matthew

gas/
2015-11-18  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-arm.c (arm_archs): Add "armv8.2-a".
	* doc/c-arm.texi (-march): Add "armv8.2-a".

include/opcode/
2015-11-18  Matthew Wahab  <matthew.wahab@arm.com>

	* arm.h (ARM_EXT2_V8_2A): New.
	(ARM_ARCH_V8_2A): New.
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