private void setMapDataBit(byte[] data, int index) {
		int byteOffset = index / 8;
		int bitMask = 1 << (index % 8);
		data[byteOffset] = (byte)(data[byteOffset] | bitMask);
	}
Returns a bit map corresponding to all buffers modified since
the original version (e.g., oldest).  This identifies all buffers contained within the original
version (e.g., oldest) which have been modified during any revision up until the original version.
NOTE: The bit mask may identify buffers which have been removed in the current version.
Ghidra/Framework/DB/src/main/java/db/buffers/VersionFileHandler.java