ARMv6-M support

[Paul Brook]

The attached patch adds ARMv6-M architecture support to binutils.  This is 
basically the Thumb bits of conventional ARMv6, plus a few system 
instructions from Thumb-2.

Tested on arm-none-eabi.
Applied to cvs head.

Paul

2008-03-04  Paul Brook  <paul@codesourcery.com>

	gas/
	* config/tc-arm.c (arm_ext_barrier, arm_ext_msr): New.
	(arm_ext_v7m): Rename...
	(arm_ext_m): ... to this.  Include v6-M.
	(do_t_add_sub): Allow narrow low-reg non flag setting adds.
	(do_t_mrs, do_t_msr, aeabi_set_public_attributes): Use arm_ext_m.
	(md_assemble): Allow wide msr instructions.
	(insns): Add classifications for v6-m instructions.
	(arm_cpu_option_table): Add cortex-m1.
	(arm_arch_option_table): Add armv6-m.
	(cpu_arch): Add ARM_ARCH_V6M.  Fix numbering of other v6 variants.

	gas/testsuite/
	* gas/arm/archv6m.d: New test.
	* gas/arm/archv6m.s: New test.
	* gas/arm/t16-bad.s: Test low register non flag setting add.
	* gas/arm/t16-bad.l: Update expected output.

	include/opcode/
	* arm.h (ARM_EXT_V6M, ARM_EXT_BARRIER, ARM_EXT_THUMB_MSR): Define.
	(ARM_AEXT_V6T2, ARM_AEXT_V7_ARM, ARM_AEXT_V7M): Use new flags.
	(ARM_AEXT_V6M, ARM_ARCH_V6M): Define.
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