Revert "Revert "Remove 2.0->3.5 entirely""

This reverts commit 0b0d138a15ad7d85842ec8d1a255bc0b845626b0.
Revert "Revert "Don't expect AOT caches in 2.0/ anymore""

This reverts commit 82c89be9299984d9e98fec4b27b9f63ad166ee71.