@Override
	public boolean removed(Program program, AddressSetView set, TaskMonitor monitor, MessageLog log)
			throws CancelledException {
		return false;
	}
This function tries to determine the fill value used by the current program.
The byte value occurring most is the winner.

@return filler value
@throws Exception
Ghidra/Features/Base/src/main/java/ghidra/app/analyzers/CondenseFillerBytesAnalyzer.java