private int getIndexOfSubBlockToSplit(long offset) {
		for (int i = 0; i < subBlocks.size(); i++) {
			if (subBlocks.get(i).contains(offset)) {
				return i;
			}
		}
		throw new IllegalArgumentException("offset " + offset + " not in this block");
	}
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