* config/s390/s390.md ("movti", "*movdi_31", "*movdf_31"): Use 'o' instead
	of 'm' constraint in forced-split alternatives.
	("*adddi3_31", "*subdi3_31"): Likewise.  Also, pass 0 instead of 1 as
	VALIDATE_ADDRESS parameter to operand_subword.
	* gcc.dg/20030321-1.c: New test.

From-SVN: r64718