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Re: Fix bug in gcse

> > > GCSE segfaults in constprop_register when NEXT_INSN (insn) == NULL
> > > when compiling following testcase on machine supporting 
> > > -fprefetch-loop-arrays with "-O2 -fprefetch-loop-arrays".
> > 
> > It does?  On which branch?  I couldn't reproduce it with
> > "-march=pentium4 -O2 -fprefetch-loop-arrays" for either 
> > 3.3 or mainline.
> 
> I believe it is the case for x86-64, but I may be wrong.
> (x86-64 is failing in some SPEC tests since the jump bypassing changes
> went in)

Yes, you are right, some SPEC2000 tests are failing on x86-64 when using
mainline compiler and this patch fixes it.

Josef
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