[arm] Allow more CPU feature flags

[Paul Brook]

The Arm gas backend uses a bitmask to keep track of the different instruction 
sets. This is currently a "long" integer, and almost all the bits have been 
used. I'm going to be adding several new architecture variants in the near 
future, so need more bits.

The attached patch changes the feature flags from a long to a struct. The main 
complication is that we want to use these flags both both static initialisers 
and for testing features at runtime. This is solved by introducing a bunch of 
new static variables in tc-arm.c.

The patch is bases on an original Patch by Richard Earnshaw:
http://sourceware.org/ml/binutils/2005-03/msg00352.html

Tested with cross to arm-none-eabi
Ok?

Paul

2006-01-30  Paul Brook  <paul@codesourcery.com>
	Richard Earnshaw <rearnsha@arm.com>

	* gas/config/tc-arm.c: Use arm_feature_set.
	(arm_ext_*, arm_arch_full, arm_arch_t2, arm_arch_none,
	arm_cext_iwmmxt, arm_cext_xscale, arm_cext_maverick, fpu_fpa_ext_v1,
	fpu_fpa_ext_v2, fpu_vfp_ext_v1xd, fpu_vfp_ext_v1, fpu_vfp_ext_v2):
	New variables.
	(insns): Use them.
	(md_atof, opcode_select, opcode_select, md_assemble, md_assemble,
	md_begin, arm_parse_extension, arm_parse_cpu, arm_parse_arch,
	arm_parse_fpu, arm_parse_float_abi, aeabi_set_public_attributes,
	s_arm_cpu, s_arm_arch, s_arm_fpu): Use macros for accessing CPU
	feature flags.
	(arm_legacy_option_table, arm_option_cpu_value_table): New types.
	(arm_opts): Move old cpu/arch options from here...
	(arm_legacy_opts): ... to here.
	(md_parse_option): Search arm_legacy_opts.
	(arm_cpus, arm_archs, arm_extensions, arm_fpus)
	(arm_float_abis, arm_eabis): Make const.

	* include/opcode/arm.h: Use ARM_CPU_FEATURE.
	(ARM_AEXT_*, FPU_ENDIAN_PURE, FPU_VFP_HARD): New.
	(arm_feature_set): Change to a structure.
	(ARM_CPU_HAS_FEATURE, ARM_MERGE_FEATURE_SETS, ARM_CLEAR_FEATURE,
	ARM_FEATURE): New macros.
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