[Bug jit/64206] fake.so is unlinked too early for some users

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64206

--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Created attachment 34219
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34219&action=edit
Work-in-progress patch to fix this

The attached patch implements the ideas we talked about (needs some comments
and a ChangeLog).

Uli: does this fix the issue for you?