SonarCloud reports this branch is never taken in AddLNode::Ideal:

  // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)"
  // into "(X<<1)+Y" and let shift-folding happen.
  if( op2 == Op_AddL &&
      in2->in(1) == in1 &&
      op1 != Op_ConL &&
      0 ) {
    Node *shift = phase->transform(new LShiftLNode(in1,phase->intcon(1)));
    return new AddLNode(shift,in2->in(2));
  }

Notice the trailing "&& 0" in the condition. Seems to be that way since the initial load.