public boolean contains(Register reg) {
		if (equals(reg)) {
			return true;
		}
		for (Register child : childRegisters) {
			if (child.contains(reg)) {
				return true;
			}
		}
		return false;
	}
Determines if reg is contained within this register. Method does not work for bit registers
(e.g., context-bits)

@param reg another register
@return true if reg equals this register or is contained within it.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/Register.java