[Bug rtl-optimization/38711] ira should not be using df-lr except at -O1.

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38711

Bug 38711 depends on bug 54961, which changed state.

Bug 54961 Summary: FAIL: gfortran.dg/pr48757.f  -O  (internal compiler error) 
after revision 192440
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54961

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |FIXED