Code generated by bpf2c should permit viewing local variables when debugging

Code generated by bpf2c permits source-level debugging of BPF programs but doesn't easily permit viewing local variables.

bpf2c should parse the dwarfv5 data and use data to do register -> local variable mapping for the debugger.

Start by locating bpf2c and its source-level debugging output, then review how DWARFv5 data is currently handled. Define the register-to-local-variable mapping needed by the debugger and verify that generated BPF programs expose local variables during a debugging session.

Written by the indexing model from the issue text.