real.h (struct real_format): Split the signbit field into two two fields, signbit_ro and signbit_rw.


	* real.h (struct real_format): Split the signbit field into two
	two fields, signbit_ro and signbit_rw.
	* real.c (ieee_single_format, mips_single_format, ieee_double_format,
	mips_double_format, ieee_extended_motorola_format,
	ieee_extended_intel_96_format, ieee_extended_intel_96_round_53_format,
	ieee_extended_intel_128_format, ibm_extended_format,
	mips_extended_format, ieee_quad_format, mips_quad_format,
	vax_f_format, vax_d_format, vax_g_format, i370_single_format,
	i370_double_format, c4x_single_format, c4x_extended_format,
	real_internal_format): Update initializers for new field.
	* builtins.c (expand_builtin_signbit): Use signbit_ro field of the
	real_format structure.
	* optabs.c (expand_absneg_bit, expand_copysign): Use signbit_rw
	field of the real_format structure.

From-SVN: r96471