[Bug debug/94459] Missing c++ debug information for 'auto&' return type

[ssbssa at yahoo dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94459

--- Comment #5 from Hannes Domani <ssbssa at yahoo dot de> ---
I also should mention that this is a precursor to fix gdb_bug 24154:
https://sourceware.org/bugzilla/show_bug.cgi?id=24154