* read.c (cons): Conditionalize parsing of expression. Move

	* read.c (cons): Conditionalize parsing of expression.  Move
	putting value into object file into separate function.  Separate
	out MRI and WANT_BITFIELDS cases into separate functions.
	(emit_expr): New function to write data into object file.
	Conditionalize on TC_CONS_FIX_NEW and TC_CONS_RELOC rather than on
	processor types.
	(parse_bitfield_cons): New function to parse bitfield expressions
	as used by i960 assemblers.  Only compiled if
	BITFIELD_CONS_EXPRESSIONS is defined.
	(parse_mri_cons): New function to parse MRI style strings.  Only
	compiled if MRI is defined.
	(parse_repeat_cons): New function to parse repeat counts.  Only
	compiled if REPEAT_CONS_EXPRESSIONS is defined.
	* read.h (emit_expr): Added declaration of new function.
	* config/tc-a29k.h (TC_CONS_RELOC): Define to be RELOC_32.
	* config/tc-h8300.h (TC_CONS_RELOC): Define to be R_RELWORD.
	* config/tc-hppa.c (parse_cons_expression_hppa): New function to
	parse a HPPA expression, rather than special case in cons
	function.
	(cons_fix_new_hppa): New function to emit an HPPA fixup, rather
	than special case in emit_expr function.
	* config/tc-hppa.h (TC_PARSE_CONS_EXPRESSION, TC_CONS_FIX_NEW):
	Define to use new functions from tc-hppa.c.
	* config/tc-i960.h (BITFIELD_CONS_EXPRESSIONS): Define.
	(WANT_BITFIELDS): Removed; now obsolete.
	* config/tc-mips.h (REPEAT_CONS_EXPRESSIONS): Define.
	* config/tc-ns32k.c (cons_fix_new_ns32k): New function to emit an
	NS32K fixup, rather than special case in emit_expr function.
	* config/tc-ns32k.h (TC_CONS_FIX_NEW): Define to be
	cons_fix_new_ns32k.  Also use PARAMS rather than checking
	__STDC__.
	* config/tc-sparc.h (TC_CONS_RELOC): Define to RELOC_32.

	* write.c (relax_and_size_seg, adjust_reloc_syms, write_contents):
	Don't core dump if gas has no information about a section.