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9fdc38c81c
Some tools (e.g. Rust tooling) produce element segment descriptors with neither elemkind or element type descriptors, but with init exprs instead of func indices (this is with the flags value of 4 in https://webassembly.github.io/spec/core/binary/modules.html#element-section). LLVM doesn't fully model reference types or the various ways to initialize element segments, but we do want to correctly parse and skip over all type sections, so this change updates the object parser to handle that case, and refactors for more clarity. The test file is updated to include one additional elem segment with a flags value of 4, an initializer value of (32.const 0) and an empty vector. Also support parsing files that export imported (undefined) functions.