[Bug testsuite/95720] [11 Regression] New dump output filename strategy invalidates tests

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95720

--- Comment #17 from Christophe Lyon <clyon at gcc dot gnu.org> ---
I think Torbjorn is right, at the fix seems as simple as handling "-T" the same
as "-Xlinker" in gcc_adjust_linker_flags_list.

However, looking at the GCC documentation, under "Linker Options", I noticed:
-e entry
-u symbol
-z keyword
where although it is unlikely that 'entry', 'symbol' or 'keyword' actually
return true to [file isfile $opt], there's still a possibility that someone
uses e.g. -e file.o :-(