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This is an alternative to #56714 that goes in the opposite direction - just outline all GlobalRefs during lowering. It is a lot simpler that #56714 at the cost of some size increase. Numbers:
sys.so .ldata size:
This PR: 159.8 MB
Master: 158.9 MB
I don't have numbers of #56714, because it's not fully complete. Additionally, it's possible that restricting GlobalRefs from arguments position would let us use a more efficient encoding in the future.