`@global` causes compile error

```ts
// index.ts
import {} from "./a"
import {} from "./b"

// a.ts
let a = t;

// b.ts
class T {}
@global export const t = new T();
```

it causes compile error
```
ERROR TS2304: Cannot find name 'T'.
   :
 2 │ @global export const t = new T();
   │                              ~
   └─ in assembly/b.ts(2,30)

FAILURE 1 compile error(s)
```
