swc_ecma_minifier:
- Introduce `bundle` mode, which can be used to parallelize processing of bundled files.
- Add a function analyzer that checks if the function references something from the outer scope.
- Split out parellsizable passes.
- Split `optimzer` into pure / non-pure.
- Run pure optimizations in parallel.
swc_ecma_minifier:
- Implement `evaluate` partially.
- Store 'expected output' from terser along with our result.
swc_ecma_transforms_base:
- `fixer`: Don't wrap `+ (a % b)`.
swc_ecma_transforms_optimization:
- `expr_simplifier`: Preserve this in calls.
