Things to do for 3.13

[markshannon]

• [ ] Tier 2 optimizations. See https://github.com/python/cpython/issues/115419 for details
• [ ] https://github.com/python/cpython/issues/118093
• [ ] JIT code improvements. Tracked in https://github.com/python/cpython/issues/115802.
• [x] Split uops that have if (oparg & 1) in stack effect and duplicate uops for range of opargs where const opargs is beneficial https://github.com/python/cpython/issues/115457
• [x] https://github.com/python/cpython/issues/115776
• [ ] Tier 2 superinstructions: "super micro-ops".
  • [x] Record micro-op pairs
  • [ ] Generate and use selected micro-op pairs
• [x] Incremental GC