private boolean getBytes(Memory memory, Address fillerAddress, byte[] programBytes) {
		try {
			memory.getBytes(fillerAddress, programBytes);
			return true;
		}
		catch (MemoryAccessException e) {
			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