fix #326 (help-wanted)

[sepiropht]

#326
The add_item function is called two times with the same id.
In one iteration we call successively DataCountSection(section).parse_items(items, idx)?; and
items.add_root(ir::Item::new(id, name, size - added, ir::Misc::new())); with the same idx value.
That why we have a panic in the add_item function.
I'm suppose that id is the same because section's code is also the same ? I didn't understand further

[fitzgen]

Hey @sepiropht, can you create a test case and steps to reproduce the bug? That would help diagnose the problem and come up with what the correct fix might be. Thanks!

[sepiropht]

To reproduce the bug i just used the file that was referenced in the issue raytrace_parallel_bg.wasm.gz
twiggy top raytrace_parallel_bg.wasm

[data-pup]

Hey @sepiropht! @fitzgen added a small test case you can use, over in #326. You should be able to use that to help finish this up. Thanks so much for opening a PR, and sorry about the slow reply!