public int getParentIndex(int dieIndex) {
		return parentIndexes[dieIndex];
	}
Returns the index of the parent of the specified DIE.

@param dieIndex index of a DIE record
@return index of the parent of specified DIE, or -1 if no parent (eg. root DIE)
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFProgram.java