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itchyny
12cdd950e9
block_mark_referenced walks the joined block backwards and skips the
body of any definition not yet marked referenced, so a library must
precede its importers. f58787c41 registered a library before walking
its dependencies, to have somewhere to keep the `loading` flag, which
reversed that order and made block_drop_unreferenced free definitions
that are still referenced through bound_by.
Keep the libraries being loaded on a stack threaded through the
load_library frames instead, so registration can move back after the
dependency walk.