[Bug c++/67343] C++ mangler does not follow ABI for unresolved names in expressions

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67343

--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
Created attachment 49828
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49828&action=edit
WIP Fix

Here's my current patch for this bug, but I think I'm going to hold off on it
pending the resolution of ABI issue 38.