swc_ecma_minifier:
- `if_return`: Allow side-effect-free statements to come after `if_return`.
- `collapse_vars`: Move variables without init to first.
- `analyzer`: Remove useless fields.
- Don't drop `return` tokens if there's a finally block.
- `drop_return_value`: Drop side-effect-free return arguments.
- `make_sequences`: Don't inject `void 0` to return args.
- `if_terminate`: Move to the pure optimizer.
- Fix a bug related to `RegExp`.
swc_ecma_codegen:
- Don't panic on `Pat::Invalid`.
- Fix codegen of unary minus. (#2213)
swc_ecma_minifier:
- Remove identifier of function expressions if a variable with same name exists.
- `sequences`: Merge into the argument of a throw statement.
- Use `ignore_return_value` for `void` expressions.
- Improve inlining.
- Drop last `return` if the return value is not used.
- `sequences`: Merge `c++; use(c)` as `use(++c)`.
- `sequences`: Merge assignments with an operator.
- `comparisons`: Optimize the comparison operator if type is equivalent.
- Fix `negate_cost`.
- `unused`: Fix order or variable initalizer when variables are dropped.
- Fix `top_retain` option.
- `if_return`: Don't merge nested if it's wrong to do so. (#2214)
- Fix negation of `if_return`.
