swc_ecma_minifier:
- Remove useless `0` in sequence expressions.
- `analyzer`: Don't treat fn decl as fn expr.
- `sequences`: Use sequence expressions in front of `b`.
- `if_return`: Drop else token within same pass. (#2044)
- Fix counting logic for `pass`. (#2044)
- `analyzer`: Fix `ref_count`.
- `hygiene`: Implement `visit_prop_name`.
- `ignore_return_value`: Property access to function parameters may have side effects.
- `inline`: Treat `!0` as literal.
- Remove some dead codes if `unused` is enabled.
swc_ecma_utils:
- Fix `may_have_side_effects`.
