I found that the relax failure for execute/930628-1.c is due to gas

I found that the relax failure for execute/930628-1.c is due to gas
incorrectly relaxing an out-of-range conditional branch with delay slot.
It turned:
                        bf.s    L6              (slot mov.l   r12,@(44,r0))
into:

   2c:  8f 01 a0 8b     bf.s    32 <_main+32>   (slot bra       L6)
   30:  00 09           nop
   32:  10 cb           mov.l   r12,@(44,r0)

	* config/tc-sh (COND_JUMP_DELAY, COND12_DELAY_LENGTH): Define.
	Changed all users of COND12_DELAY.