…6134)

Before this it would raise if zjit wasn't enabled
and raise a different exception if zjit was but extended stats were
not (_some_ stats are available).

## Summary
- Replace the RPO fixed-point iteration in `infer_types` with a worklist-based approach
- Instead of re-scanning every reachable block on each iteration, only re-process blocks whose incoming types actually changed
- Add `BitSet::remove` helper for worklist membership tracking

## Benchmark
On lobsters (release+stats build, 10 iterations):

| Stat | Branch | Master | Delta |
|------|--------|--------|-------|
| compile_time | 1,604ms | 1,808ms | -204ms (-11.3%) |
| Avg iter time | 766ms | 807ms | -41ms (-5.1%) |

This allows using the same code for both "specially named" and regular
methods. This uses :__delegate as the name, which may be visible to
users in backtraces for these methods.

ruby/delegate@82125cd687

Co-authored-by: Luke Gruber <luke.gruber@shopify.com>

ruby/delegate@39d2c9aa00

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>