Add some better debugging output.
Add some better debugging output.

ultimate-pa/benchexec,ultimate-pa/benchexec,sosy-lab/benchexec,IljaZakharov/benchexec,martin-neuhaeusser/benchexec,dbeyer/benchexec,martin-neuhaeusser/benchexec,sosy-lab/benchexec,IljaZakharov/benchexec,sosy-lab/benchexec,ultimate-pa/benchexec,sosy-lab/benchexec,dbeyer/benchexec,sosy-lab/benchexec,dbeyer/benchexec,IljaZakharov/benchexec,IljaZakharov/benchexec,dbeyer/benchexec,martin-neuhaeusser/benchexec,ultimate-pa/benchexec,martin-neuhaeusser/benchexec,sosy-lab/benchexec,ultimate-pa/benchexec,ultimate-pa/benchexec