public boolean hasAnyValue() {
		int byteLength = bytes.length / 2;
		for (int i = 0; i < byteLength; i++) {
			if (bytes[i] != 0) {
				return true;
			}
		}
		return false;
	}
Tests if the all the mask bits from startBit (least significant bit) to endBit (most significant bit)
are on.
@param startBit the least significant bit position 
@param endBit the most significant bit position
@return true if all mask bits from startBit to endBit are on.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/RegisterValue.java