[Bug lto/119956] lockfile / lto-ltrans-cache have poor testing coverage

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119956

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
This might be kind of easy to improve upon by extending lib/lto.exp's torture
variants.