message: Give the main loop a big comment explaining it.
  Remove some commented out duplicate code.
diff: @@ -413,6 +413,19 @@ impl FuncTranslator {
  // the order of relocations is not important.
  let mut relocations: HashMap<ElfSectionIndex, Vec<Relocation>> = HashMap::new();
  + // Each iteration of this loop pulls a section and the relocations
  + // relocations that apply to it. We begin with the ".wasmer_function"
  + // section, and then parse all relocation sections that apply to that
  + // section. Those relocations may refer to additional sections which we
  + // then add to the worklist until we've visited the closure of
  + // everything needed to run the code in ".wasmer_function".
  + //
  + // `worklist` is the list of sections we have yet to visit. It never
  + // contains any duplicates or sections we've already visited. `visited`
  + // contains all the sections we've ever added to the worklist in a set
  + // so that we can quickly check whether a section is new before adding
  + // it to worklist. `section_to_custom_section` is filled in with all
  + // the sections we want to include.
  worklist.push(wasmer_function_index);
  visited.insert(wasmer_function_index);
  while let Some(section_index) = worklist.pop() {
  @@ -482,7 +495,6 @@ impl FuncTranslator {
  }
  }
  - /*
  let mut custom_sections = section_to_custom_section
  .iter()
  .map(|(elf_section_index, custom_section_index)| {
  @@ -498,23 +510,6 @@ impl FuncTranslator {
  )
  })
  .collect::<Vec<_>>();
  - */
  - let mut custom_sections = section_to_custom_section
  - .iter()
  - .map(|(elf_section_index, custom_section_index)| {
  - (
  - custom_section_index,
  - CustomSection {
  - protection: CustomSectionProtection::Read,
  - bytes: SectionBody::new_with_vec(section_bytes(*elf_section_index)),
  - relocations: relocations
  - .remove_entry(elf_section_index)
  - .map_or(vec![], |(_, v)| v),
  - },
  - )
  - })
  - .collect::<Vec<_>>();
  -
  custom_sections.sort_unstable_by_key(|a| a.0);
  let custom_sections = custom_sections
  .into_iter()
  