[RFA/ARM 07/21] Add support for new options to DMB/DSB

[Matthew Gretton-Dann]

ARMv8 adds new options to DMB/DSB in A32/T32.

We do a bit of re-engineering in opcodes/arm-dis.c to common up the
decode of the options to DMB/DSB.

gas/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* config/tc-arm.c (asm_barrier_opt): Add arch field.
	(mark_feature_used): New function.
	(parse_barrier): Check specified option is valid for the
	specified architecture.
	(UL_BARRIER): New macro.
	(barrier_opt_names): Update for new barrier options.

gas/testsuite/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* gas/arm/armv8-a-barrier.s: New testcase.
	* gas/arm/armv8-a-barrier-arm.d: Likewise.
	* gas/arm/armv8-a-barrier-thumb.d: Likewise.

opcodes/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* arm-dis.c (data_barrier_option): New function.
	(print_insn_arm): Use data_barrier_option.
	(print_insn_thumb32): Use data_barrier_option.
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