[Bug tree-optimization/107767] [13 Regression] switch to table conversion happening even though using btq is better

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
> this code should not be treated as if-else-if-else-if.

Why? It's an equivalent representation as all ifs have a return statement. One
another equivalent representation is:

    switch (dst_port)
    {
      case 15:
      case 23:
      case 47:
      case 45:
      case 42:
      case 1:
      case 2:
      case 3:
        return 1;
      default:
        return 0;
    }