gh-131798: Support generator frames in the JIT optimizer

[Fidget-Spinner]

This PR covers the iteration of generators in the JIT optimizer.

Benchmark results: 1.5% faster on AArch64 macOS https://github.com/facebookexperimental/free-threading-benchmarking/blob/main/results/bm-20260102-3.15.0a3%2B-8f7b4f4-JIT/bm-20260102-macm4pro-arm64-Fidget%252dSpinner-cover_more_frames-3.15.0a3%2B-8f7b4f4-vs-base.md

0% faster on x86-64 Linux. https://github.com/facebookexperimental/free-threading-benchmarking/blob/main/results/bm-20260102-3.15.0a3%2B-8f7b4f4-JIT/bm-20260102-vultr-x86_64-Fidget%252dSpinner-cover_more_frames-3.15.0a3%2B-8f7b4f4-vs-base.md

I think the macOS results are a little suspicious, maybe the baseline was when the machine was too hot or something? No clue.

• Issue: gh-131798