public static DWARFExpressionOperandType[] getOperandTypesFor(int opcode) {
		DWARFExpressionOperandType[] results = OPtoOperandTypes.get(opcode);
		return results != null ? results : EMPTY_OPERANDTYPES;
	}
Map of opcode to its expected operand types.  If the opcode isn't found in this map,
it is assumed to not take any operands.
Even if Ghidra can't evaluate a DWARF opCode, we should still keep it in this
map so we can parse the expression and display it as a string.
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/expression/DWARFExpressionOpCodes.java