[Bug fortran/79165] [7 Regression] 100% compile-time increase for polyhedron aermod between r244557 and r244598

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79165

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> r244557: 19.77s
> r244586: 34.18s
> r244587: 33.91s
> 
> so neither party is guilty...  bisecting.
> 
> r244575: 19.66s
> r244581: 33.84s
> r244578: 19.82s
> r244580: 19.76s
> r244581: 19.88s (?!)

 ^^^ err, forgot the make all-gcc here

it's really r244581, the tree.c hunk.