Add debuginfod client in lldb

[noajshu]

The debuginfod client in llvm is now integrated in two llvm tools llvm-debuginfod-find and llvm-symbolizer. lldb is a natural next target to integrate the client library.

[fche]

cc: @kwk fyi

[russelltg]

I'm interested in working on this--let me know if someone is already working on this as to not duplicate work

[russelltg]

I'm thinking it likely makes sense to tackle this in 3 separate changesets: source file, debug info, and executable fetching from debuginfod.

[russelltg]

I think this is added as of lldb 18.

It still can't fetch sources, but can fetch binaries and debuginfo.

[kjeremy]

I think this is added as of lldb 18.

It still can't fetch sources, but can fetch binaries and debuginfo.

This doesn't seem to fetch binaries for me while gdb can. Is there some configuration that needs to happen?

[vogelsgesang]

It still can't fetch sources, but can fetch binaries and debuginfo.

Related thread on discourse: https://discourse.llvm.org/t/rfc-support-fetching-source-files-with-debuginfod/86579

Draft PR: #141773