Disambiguate dummy symbols

[OndrikB]

This makes the dummy symbols diffable even if there is more than one. I am aware that this could be considered a hacky fix, but it does do its job.

[encounter]

Appreciate the PR! Looks like the formatting is failing (cargo +nightly fmt will fix)

I think I'd prefer to do this logic when we're creating the dummy symbols in symbols_by_section. Was there a specific reason you chose this approach?

[OndrikB]

The compiler I'm using creates a new .text section for every single function, so, from my reading of the code, renaming them when creating them in symbols_by_section would not make a difference.

[encounter]

More specifically, we could track the section names via HashMap in parse, then pass the unique_section_index to symbols_by_section as we go.

[encounter]

Looks great, thank you!