[Bug tree-optimization/52275] The polyhedron test air.f90 is miscompiled with '-O2 -floop-flatten' after revision 184265

[grosser at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52275

--- Comment #3 from Tobias Grosser <grosser at gcc dot gnu.org> 2012-02-16 14:00:29 UTC ---
It seems there Sebastian himself sees the loop flatteing pass as currently
unstable: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50335#c8

I would propose to follow his suggestion, disable it for now and readd it as
soon as graphite is moved to isl. If anybody else can contribute a patch that
fixes the remaining loop flattening problems, I am obviously glad to have a
look,