[Bug c++/92679] Test case with failing unordered_map search when key is type_index

[marcello.m at yahoo dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92679

--- Comment #1 from Marcello Mansueto <marcello.m at yahoo dot com> ---
Created attachment 47365
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47365&action=edit
Preprocessed version of the file that triggers the bug