[PATCH 2/2][Aarch64][gas] Add support for PAN architecture extension.

[Matthew Wahab]

The ARMv8.1 architecture introduced the Privileged Access Never extension. This
adds a processor state field PSTATE.PAN which can be accessed using the MRS/MSR
instructions.

This patch adds support and tests for the PAN architecture feature and processor
state field to GAS under a new aarch64 extension "pan".

Tested for aarch64-none-linux-gnu with check-binutils and check-gas with no
failures. Tested html documentation in browser.

Ok for trunk?
Matthew

gas/
2015-05-20  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-aarch64.c (parse_sys_reg): New parameter.  Check
	target support.  Fix whitespace.
	(parse_operands): Update for parse_sys_reg changes.
	(aarch64_features): Add "pan".
	* doc/c-aarch64.texi (Aarch64 Extensions): Add "pan".

gas/testsuite
2015-05-20  Matthew Wahab  <matthew.wahab@arm.com>

	* pan-directive.d: New.
	* pan.d: New.
	* pan.s: New
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