[PATCH] Fix PR target/37483

[Eric Botcazou]

> No, this last one does not always follow.  You can have if_info->b != 0 and
> still have if_info->insn_b == 0.  In fact this is the actual case I am
> fixing for MIPS.
>
> When there is only one arm and it sets the value to A then B is X (see
> noce_process_if_block).  E.g. with the pr37395.c test:
>
>   X: (reg/v:SI 195 [ j ])
>   A: (const_int 0)
>   B: (reg/v:SI 195 [ j ])
>   INSN_A:
>
>     (insn 9 8 10 3 pr37395.c:8 (set (reg/v:SI 195 [ j ])
>             (const_int 0 [0x0])) 265 {*movsi_internal} (nil))
>   INSN_B: NULL

Sorry, I overlooked that.  The patch is OK for mainline, but please install it 
under PR rtl-optimization/37483 and re-categorize the PR.

-- 
Eric Botcazou