fixdfdi.h (__fixunsdfdi, __fixdfdi): Add prototypes.

fixdfdi.h (__fixunsdfdi, __fixdfdi): Add prototypes.

	* config/s390/fixdfdi.h (__fixunsdfdi, __fixdfdi): Add prototypes.
	(__fixunssfdi, __fixsfdi): Likewise.
	* config/s390/s390.c (s390_single_hi): Initialize 'value'.
	(s390_single_qi): Likewise.
	(s390_emit_epilogue): Initialize 'offset'.  Remove signed vs.
	unsigned comparison warning.
	(s390_return_addr_rtx): New function.
	* config/s390/s390-protos.h (s390_return_addr_rtx): Declare it.
	* config/s390/s390.h (RETURN_ADDR_RTX): Use it.
	(HARD_REGNO_MODE_OK): Rewrite condition to silence warnings.

From-SVN: r58379