default void clear(Lifespan span, Register register, TaskMonitor monitor)
			throws CancelledException {
		clear(span, TraceRegisterUtils.rangeForRegister(register), true, monitor);
	}
Clear the units contained within the given span and register

<p>
Any units alive before the given span are truncated instead of deleted.

@param span the span to clear
@param register the register
@param monitor a monitor for progress and cancellation
@throws CancelledException if the clear is cancelled
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/model/listing/TraceBaseDefinedUnitsView.java