Debug Symbols in VECs

[insertinterestingnamehere]

This is somewhat aspirational, but currently there aren't any debug symbols available in VECs. No backtrace library gives meaningful results and gdb doesn't work. This makes debugging a nastier business than it already would be for something so unorthodox as VECs. We need to find some way to actually be able to have and use debug symbols in VECs. This will likely require a decent bit of hacking on the underlying libraries/tools, but it also seems like the kind of thing that people would really appreciate upstream. We're definitely not the first people to run into dlmopen's linker namespaces not working with gdb.