[Bug debug/90575] -gsplit-dwarf leaves behind .dwo file in cwd

[sbergman at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90575

--- Comment #2 from Stephan Bergmann <sbergman at redhat dot com> ---
(In reply to Richard Biener from comment #1)
> But that's how -gsplit-dwarf is designed.

Shouldn't it then be documented where any .dwo files are stored?  At least in
combination with -o in comment 0, cwd looks like a strange choice.