[tree-ssa] reaching def. question

[law@redhat.com]

In message <1079535066.32455.54.camel@localhost.localdomain>, Diego Novillo wri
tes:
 >Currently, DOM is careful to call out-of-ssa every time it needs to
 >rename variables that may have been moved around like this.  This is a
 >design bug.  Taking variables out of SSA ought to be done by the
 >renamer.  Individual passes should be free to mark *any* variable to be
 >renamed.  I will try and get to this before the merge.
Please stay in contact with me before you do this.  I'm also going to likely
be in this code as there are some serious compile-time performance issues
that need to be addressed.

jeff