no_new_pseudos

[Paolo Bonzini]

Kenneth Zadeck wrote:
> I do not remember if it was stevenb or bonzini that observed that
> because of changes that came with the dataflow branch it is now trivial
> to get rid of no_new_pseudos.

For the record, this was Steven's observation.  And Kenner confirming 
that this was the original purpose of no_new_pseudos is very 
encouraging, since he's an integral part of the history of GCC's RTL 
passes. :-)

I think that, as a first step, we should remove setting no_new_pseudos 
to 1 until just before reload.  This will effectively turn 
no_new_pseudos into a synonym for "reload_in_progress || reload_completed".

Paolo