s390: Align *cjump_64 and *icjump_64

s390: Align *cjump_64 and *icjump_64

During machine reorg we optimize backward jumps and transform insns as
e.g.

(jump_insn 118 117 119 (set (pc)
        (if_then_else (ne (reg:CCRAW 33 %cc)
                (const_int 8 [0x8]))
            (label_ref 134)
            (pc))) "dec_math_1.f90":204:8 discrim 1 2161 {*cjump_64}
     (expr_list:REG_DEAD (reg:CCRAW 33 %cc)
        (int_list:REG_BR_PROB 719407028 (nil)))
 -> 134)

into

(jump_insn 118 117 432 (set (pc)
        (if_then_else (ne (reg:CCRAW 33 %cc)
                (const_int 8 [0x8]))
            (pc)
            (label_ref 433))) "dec_math_1.f90":204:8 discrim 1 -1
     (expr_list:REG_DEAD (reg:CCRAW 33 %cc)
        (int_list:REG_BR_PROB 719407028 (nil)))
 -> 433)

The latter is not recognized anymore since *icjump_64 only matches
CC_REGNUM against zero.  Fixed by aligning *cjump_64 and *icjump_64.

gcc/ChangeLog:

	* config/s390/s390.md (*icjump_64): Allow raw CC comparisons,
	i.e., any constant integer between 0 and 15 for CC comparisons.