lib/Driver/Tools.cpp always passing a flang internal debug option

Following line:
```
LowerCmdArgs.push_back("-x"); LowerCmdArgs.push_back("120"); LowerCmdArgs.push_back("0x1000"); // debug lite
```
Seems a strange thing to do instead of just passing a separate option for whatever profiling one need to do. Is it deliberate or done by mistake?