[RFC] Merge criteria for tree-ssa

[law@redhat.com]

In message <40296128.7030304@moene.indiv.nluug.nl>, Toon Moene writes:
 >However, that's not necessary - distributors of complete OS's could use 
 >g77 and gfortran separately (by providing g77 in /opt/bin/g77 for instance).
Precisely.  I wouldn't be terribly surprised to see a legacy g77 built
from pre-ssa sources until such point as gfortran has evolved enough
to completely replace g77.

jeff