s390-protos.h (shift_count_operand): Add prototype.

	* config/s390/s390-protos.h (shift_count_operand): Add prototype.
	* config/s390/s390.c (shift_count_operand): New function.
	(s390_extra_constraint): Use it to implement 'Y' constraint.
	(print_shift_count_operand): New function.
	(print_operand): Use it to implement '%Y'.
	* config/s390/s390.h (EXTRA_ADDRESS_CONSTRAINT): Add 'Y' constraint.
	(PREDICATE_CODES): Add shift_count_operand.
	* config/s390/s390.md ("rotldi3"): Merge alternatives,
	using "shift_count_operand" predicate and "Y" constraint,
	and "%Y" to output the combined shift count.
	("rotlsi3"): Likewise.
	("ashldi3", "*ashldi3_31", "*ashldi3_64"): Likewise.
	("ashrdi3", "*ashrdi3_31", "*ashrdi3_64", "*ashrdi3_cc_31",
	"*ashrdi3_cc_64", "*ashrdi3_cconly_31", "*ashrdi3_cconly_64"): Likewise.
	("ashlsi3", "ashrsi3", "*ashrsi3_cc", "*ashrsi3_cconly"): Likewise.
	("lshrdi3", "*lshrdi3_31", "*lshrdi3_64"): Likewise.
	("lshrsi3"): Likewise.

From-SVN: r72661