* real.c (REAL_WORDS_BIG_ENDIAN): Make 1 for DEC.
	(LARGEST_EXPONENT_IS_NORMAL): Ditto.
	(VAX_HALFWORD_ORDER): Define (1 for DEC VAX, 0 otherwise).
	(TARGET_G_FLOAT): Default to 0 if not defined.
	(ieeetoe): New, common routine to convert target format floats
	to internal form.
	(e24toe, e53toe): Change to use ieeetoe, distinguish DEC
	vs. others.
	(e113toe): Change to use ieeetoe.
	(REAL_WORDS_BIG_ENDIAN): Make sure it is 0 for DEC and 1 for
	IBM.
	(e53toe): Assume IEEE if non of DEC, IBM and C4X is defined.
	(e64toe): Remove special cases for DEC and IBM. Remove support for
	ARM_EXTENDED_IEEE_FORMAT.
	(e24toe): Remove special cases for DEC.
	(significand_size): Simplify. Indent.
	(ieee_format, ieee_24, ieee_53, ieee_64, ieee_113): New.
	(etoieee, toieee): New.
	(etoe113, toe113, etoe64, toe64, etoe53, toe53, etoe24, toe24): Use
	etoieee and toieee for IEEE arithmetic.

From-SVN: r55683