This has been previously discussed to some extent in the LTO GSoC thread, but I myself mostly have been focusing on the infrastructure part of SwiftWasm, so I'd rather avoid retelling things I don't know well. I saw @kateinoigakukun have been doing some work and research on this, you can see his posts in that thread. I also know he recently submitted a PR that to me seems to be related to this, but again, I don't have enough expertise in that area to provide more details.
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