fix(register): fix wrong rvalue binding (should be const ref)

include/register.h

@@ -36,7 +36,7 @@ struct Register {
     Register &operator=(const Register &rhs) = delete;
 
     template <concepts::bit_convertible <_Len> _Tp>
-    void operator <= (_Tp &&value) {
+    void operator <= (const _Tp &value) {
         debug::assert(!this->_M_assigned, "Register is double assigned in this cycle.");
         this->_M_assigned = true;
         this->_M_new = static_cast <max_size_t> (value);