Things to do for 3.13

[markshannon]

• Tier 2 optimizations. See Tier 2 optimizations for 3.13 python/cpython#115419 for details
• Increase fraction of code executed by tier 2. python/cpython#118093
• JIT code improvements. Tracked in Improving JIT code quality python/cpython#115802.
• Split uops that have if (oparg & 1) in stack effect and duplicate uops for range of opargs where const opargs is beneficial Split micro-ops that have different behavior depending on low bit of oparg.  python/cpython#115457
• Inline values array into the object python/cpython#115776
• Tier 2 superinstructions: "super micro-ops".
  • Record micro-op pairs
  • Generate and use selected micro-op pairs
• Incremental GC