[Bug ipa/86590] Codegen is poor when passing std::string by value with _GLIBCXX_EXTERN_TEMPLATE undefined

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86590

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
-finline-limit=80 or higher (or more precisely --param
max-inline-insns-auto=40) lets it optimize.