Add XMM FPU registers save/restore support.

	* i386/include/mach/i386/fp_reg.h (struct i386_fp_regs): Invert array
	indices.
	(struct i386_xfp_save): New structure.
	(FP_387X): New macro.
	* i386/i386/thread.h (struct i386_fpsave_state): Add xfp_save_state
	member, keep existing fp_save_state and fp_regs members in an unnamed
	union member.  Move fp_valid member to the end of the structure.
	* i386/i386/fpu.h (fxsave, fxrstor): New macros.
	(fpu_save_context): Use fxsave() when FPU is FXSR-capable.
	* i386/i386/fpu.c: Include <i386/locore.h>
	(mxcsr_feature_mask): New variable.
	(fp_save, fp_load): Add declaration.
	(init_fpu): Add FXSR-capable FPU detection.
	(fpu_module_init): Request 16-byte alignment to zinit() for
	i386_fpsave_state structures.
	(twd_i387_to_fxsr, twd_fxsr_to_i387): New functions.
	(fpu_set_state): Convert FPU state when FPU is FXSR-capable.
	(fpu_get_state): Convert FPU state when FPU is FXSR-capable.
        (fpexterrflt): Pass to i386_exception either xfp_save_state or
        fp_save_state according to FPU type.
	(fpastintr): Likewise.
	(fp_load): Likewise.  Use fxrstor() when FPU is FXSR-capable.
	(fp_save): Use fxsave() when FPU is FXSR-capable.
	(fp_state_alloc): Add FXSR-aware initialization.

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