[PATCH 2/2][Aarch64][gas] Add support for ARMv8.1a Limited Ordering Regions extension.

[Matthew Wahab]

ARMv8.1a introduces an optional architectural extension called Limited Ordering
Regions which adds new variants of the load-acquire and store-release
instructions. This patch adds support in gas under the new armv8-a architecture
extension "lor".

Ok for trunk?
Matthew

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

	* config/tc-aarch64.c (aarch64_features): Add "lor".
	* doc/c-aarch64.c (Aarch64 Extensions): Add "lor" to list of
	architecture extensions.

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

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

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