Update libsyntax and rustc to use serialization2 #3690
Merged
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This is part of my migration to serialization2. These two patches get rid of the old serializers, but it doesn't yet rename serialization2 to serialization. I haven't figured out yet how to do this transition without snapshots, so we'll need to land the first patch, "migrate libsyntax/rustc to auto_serialize2", snapshot, then land "Remove the old serializers (needs snapshot)".