Synchronization Issues in IPCSimulatorContext

[mwachs5]

IPCSimulatorContext has 3 log file arrays which are read by the scala runtime and handed to ProcessLogger to be written by e.g. VCS. This structure is not protected for synchronization and can result in synchronization issues where one side is reading while the other is still writing. In practice this seems to be especially problematic when running a simulation with lots of printfs that encounters an assertion failure.