[llvm-objdump] add support for --visualize-jumps

[nickdesaulniers]

GNU objdump has these really cool features:

      --visualize-jumps          Visualize jumps by drawing ASCII art lines
      --visualize-jumps=color    Use colors in the ASCII art
      --visualize-jumps=extended-color
                                 Use extended 8-bit color codes
      --visualize-jumps=off      Disable jump visualization

these would be cool to have, as someone that runs the disassembler more than they'd like to!

[llvmbot]

@llvm/issue-subscribers-tools-llvm-objdump