[Bug rtl-optimization/64164] [4.9/5/6 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 #48 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
The errors reported in comments 44, 45, 46, and 47 are fixed in the git branch
aoliva/pr64164.  I'm giving it all some more testing before posting an updated,
consolidated patch.