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

[law at redhat dot com]

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

--- Comment #7 from Jeffrey A. Law <law at redhat dot com> ---
OK, but why does this make such a difference in the final result.  Ie, what
happens as we get into RTL.

It would also be helpful to see the current & desired output for the case where
we've regressed.