private boolean setFlagBit(int flagBitMask, boolean enable) {
		byte p = record.getByteValue(MemoryMapDBAdapter.FLAGS_COL);
		if (enable) {
			if ((p & flagBitMask) == flagBitMask) {
				return false; // no change
			}
			p |= flagBitMask;
		}
		else {
			if ((p & flagBitMask) == 0) {
				return false; // no change
			}
			p &= ~flagBitMask;
		}
		record.setByteValue(MemoryMapDBAdapter.FLAGS_COL, p);
		try {
			adapter.updateBlockRecord(record);
		}
		catch (IOException e) {
			memMap.dbError(e);
		}
		return true;
	}
Get collection of blocks which map onto this block.

@return collection of blocks which map onto this block or null if none identified
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/MemoryBlockDB.java