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9bab9d4af1
LLVM's mergefunc pass may mean that the same descriptor function is used for different closure invocation sites even when the closure itself is different. This typically only happens with LTO but in theory could happen at any time! The assert was tripping when we tried to delete the same function table entry twice, so instead of a `Vec<usize>` of entries to delete this commit switches to a `HashSet<usize>` which should do the deduplication for us and enusre that we delete each descriptor only once. Closes #1264