Compiler doesn't remove unreachable branches

This can be a limitation of the compiler.
Input:
```
const flags = {
"enabled": false
};

if (!flags["enabled"]) {
console.log("not enabled");
} else {
console.log("enabled");
}

if (flags["otherOption"]) {
console.log("other option");
}
```

Command:
```
java -jar node_modules/google-closure-compiler/compiler.jar --entry_point input.js \
--compilation_level ADVANCED_OPTIMIZATIONS \
--isolation_mode IIFE input.js
```

Output:
```
(function(){var a={enabled:!1};a.enabled?console.log("enabled"):console.log("not enabled");a.otherOption&&console.log("other option");}).call(this);
```

I would expect the output to only contain one console.log as other branches are unreachable.
Is this not possible, e.g. is it unable to determine these conditions in compilation time?