postreload-gcse.c: Obvious fix applied: don't emit jumps when we can't

[Joern RENNECKE]

Mostafa Hagog wrote:

>    
>
>RTL dumps of GCC can help understand what is going in postreload-gcse;
>since already have GCC for sh64, can you produce the RTL dumps for this
>test case ?
>

As I said already in a previous email, the struct-layout testcases are 
simply too large.
Since postreload-gcse is expected to increase code size a bit now and 
then, I don't
think your patch is to blame for any of the regressions.