EPR #412821 - Fix a crash when the ThreadTrace Object is freed before a ThreadTrace command is processed.
Also change 'None' to 'Undefined', since 'None' is a macro defined in X.h.
Affected files ...
... //depot/stg/opencl/drivers/opencl/runtime/platform/command.hpp#77 edit
... //depot/stg/opencl/drivers/opencl/runtime/platform/threadtrace.hpp#5 edit