public RegisterValue getRegisterValue(Register newRegister) {
		if (register == newRegister) {
			return this;
		}
		checkBaseRegister(newRegister);
		return new RegisterValue(newRegister, bytes);

	}
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