ARM FPU option handling cleanup

[Paul Brook]

The attached patch cleans up the ARM FPU option handling. The current tangle 
of macros checking for specific FPU variants is already somewhat unwieldy, and 
gets significantly worse when trying to add new VFP variants.

I've replaced this with a table based lookup, which enumerates all relevant 
details in a single place (arm.c:all_fpus). There should be no user-visible 
changes.

Tested on arm-none-eabi, with basic spot checks of a legacy linux FPA based 
target. Applied to SVN head.

Paul

2009-11-05  Paul Brook  <paul@codesourcery.com>

	gcc/
	* config/arm/arm.c (arm_fp_model, arm_fpu_arch, arm_fpu_tune): Remove.
	(arm_fpu_desc): New.
	(all_fpus): Add FPU details.
	(fp_model_for_fpu): Remove.
	(arm_override_options): Set and use arm_fpu_desc and arm_fpu_attr.
	(arm_output_epilogue, arm_save_coproc_regs): Use TARGET_FPA_EMU2.
	(arm_file_start): Use arm_fpu_desc.
	* config/arm/arm.h (TARGET_FPA, TARGET_MAVERICK, TARGET_VFP,
	TARGET_VFPD32, TARGET_VFP3, TARGET_NEON_FP16, TARGET_NEON): Use
	arm_fpu_desc.
	(TARGET_FPA_EMU2): Define.
	(arm_fp_model, fputype, arm_fpu_tune): Remove.
	(vfp_reg_type, arm_fpu_desc): New.
	* config/arm/arm.md (attr fpu): Simplify.
	* config/arm/fpa.md (movxf_fpa): Use TARGET_FPA_EMU2.
	* config/arm/linux-elf.h (FPUTYPE_DEFAULT): Use string value.
	* config/arm/bpabi.h (FPUTYPE_DEFAULT): Use string value.
	* config/arm/netbsd-elf.h (FPUTYPE_DEFAULT): Use string value.
	* config/arm/vxworks.h (FPUTYPE_DEFAULT): Use string value.
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