[tree-ssa] How to increase PHI capacity?

[law@redhat.com]

In message <1060034777.9007.253.camel@steven.lr-s.tudelft.nl>, Steven Bosscher 
writes:
 >> I don't understand.  What's the problem, then?  Remove the old PHI node
 >> from the phi_nodes() list, ggc_realloc it and put it back in
 >> phi_nodes().
 >
 >If that's OK with you, it's OK with me :)  I just think it would be
 >cleaner to have the ability to adjust the phi arg vector without
 >reallocating the whole phi.  But it's not a big deal now anyway.
Seems to me that if turns out to be a problem, either in terms of
maintenance or compile-time that we can easily revisit.

Jeff