[Bug jit/84288] Support jit on Solaris

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84288

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch for the linker issue:
  https://gcc.gnu.org/ml/gcc-patches/2018-02/msg00776.html