[Bug c++/67075] Infinite GC loop with ggc-min-expand=0

[luke-jr+gccbugs at utopios dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67075

--- Comment #1 from Luke Dashjr <luke-jr+gccbugs at utopios dot org> ---
Also note: ggc-min-expand=1 seems to successfully workaround this issue (but is
non-ideal for low-memory systems).