[Bug c++/127371] [modules][reflection] ICE in walk_namespace_bindings when namespaces are supplied via partitions

[mail at tobiasliese dot me via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127371

--- Comment #1 from Tobias Liese <mail at tobiasliese dot me> ---
Created attachment 65580
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65580&action=edit
Proposed fix with regression tests.