[Bug rtl-optimization/64081] [5/6/7 Regression] r217827 prevents RTL loop unroll

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081

--- Comment #58 from Segher Boessenkool <segher at gcc dot gnu.org> ---
You can keep get_simple_loop_desc, find_simple_exit etc.; just make them
inline functions or similar.

I'm sceptical that this will not cause any more problems, we're deep into
stage 4 already :-/