[dataflow] remove try_auto_increment from regmove

[Kenneth Zadeck]

Paolo Bonzini wrote:
> Probably thanks to the improved auto-inc-dec pass on dataflow branch,
> the attached patch showed no assembly change whatsoever on
> powerpc-apple-darwin for the SPEC2000 sources.  I'm committing it in
> one or two days after bootstrap/regtest on i686-pc-linux-gnu and
> unless anybody convinces me of the opposite.
>
> 1 file changed, 12 insertions(+), 230 deletions(-)
>
> Thanks to Steven for the hint.
>
> Paolo
>
> ------------------------------------------------------------------------
>
>   
Paolo,

I have no problem with this patch.  I would like to see it go in. 
However, the ppc only has pre* auto insns and the x86 has none. 

You need to test this on a machine that has post* auto insns like the
arm or the ia-64.  Unfortunately we do not have these ports working
yet.  If you want to track down some bugs on these ports, we would be
happy for the help. 

Kenny