[Bug rtl-optimization/64164] [4.9/5 Regression] one more stack slot used due to one less inlining level

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64164

--- Comment #25 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
WIP patch accidentally posted to gcc-patches:
https://gcc.gnu.org/ml/gcc-patches/2015-03/msg01460.html