[D11] Cut out a little more of the profile marker overhead in a final build. Currently all of the C# side is left intact, only the engine side is compiled out. The main reason for doing this, however, is that it fixes the graphical corruption various people have got when trying to make their own master builds, and there is a runtime graphical corruption bug which looks like it might be the exact same thing. Investigation into exactly what is going on here continues, as there may be an underlying memory scribble, as the reason why this is a problem is not understood.