This adds EH support to `EffectAnalyzer`. Before `throw` and `rethrow` conservatively set property. Now `EffectAnalyzer` has a new property `throws` to represent an expression that can throw, and expression that can throw sets `throws` correctly. When EH is enabled, any calls can throw too, so we cannot reorder them with another expression with any side effects, meaning all calls should be treated in the same way as branches when evaluating `invalidate`. This prevents many reorderings, so this patch sets `throws` for calls only when the exception handling features is enabled. This is also why I passed `--disable-exception-handling` to `wasm2js` tests. Most of code changes outside of `EffectAnalyzer` class was made in order to pass `FeatureSet` to it. `throws` isn't always set whenever an expression contains a throwable instruction. When an throwable instruction is within an inner try, it will be caught by the corresponding inner catch, so it does not set `throws`.