Comment inside return results in wrong code when AST gets printed

[sltam]

$ cat input.js
function unequal(x, y) {
  return (
    // Either one
    x < y
  ||
    x > y
  );
}

$ uglifyjs input.js -b --comments=all
function unequal(x, y) {
    return // Either one
    x < y || x > y;
}

Now unequal(x, y) always evaluates to undefined, since semicolon is auto added after "return" when this generated code is evaluated.

[sltam]

I just happened to stumble upon #112

The fix there doesn't fix this case, as the returnNode's value is the "||" node, whose's start doesn't have comment. Only the "||" node's left's left has comment.

[mishoo]

I pushed a better fix.