[Proposal] Trace functions when they are inlined

[Mitchell Hanberg]

Currently, by the time *_function and *_macro traces are emitted, I believe that inlined functions have already been inlined.

For example, if you call `Atom.to_string/1`, the `:remote_function` tracer will be emitted for `:erlang.atom_to_binary/1`.

My end goal is to know where references to inlined functions are in the code, and the least intrusive way to accomplish that I think would be emitting a `:inlined_function` (name subject to bikeshed) that includes some similar metadata to the `*_function` traces.

Let me know what you think, and please correct me if this is already possible and I just totally missed something in the docs.

Thank you,

Mitch

[José Valim]

This is a bug. We should emit the trace before they are inlined. Can you please do a bug report?

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[Mitchell Hanberg]

I will after work today, thank you José!

- Mitch