Hi all! I have been working on a GDB and LLDB python plugin that will bring debuginfod to older versions of GDB and LLDB. It's still in the early stages of development (no support for source loading, no support for Python 2...) but wanted to raise awareness of my work and say thank you for coming out with debuginfod!
You can find it here: https://github.com/schultetwin1/gdbundle-debuginfod -Matt