[PATCH 0/2] Avoid excessive CU expansion

[Tom Tromey]

This short series fixes a case of excessive CU expansion reported in
https://sourceware.org/bugzilla/show_bug.cgi?id=31010.

I split out the first patch because it seemed logically distinct.

This series depends on this patch:

https://sourceware.org/bugzilla/show_bug.cgi?id=31010

... and won't even compile without it.

Regression tested on x86-64 Fedora 40.