[macro] -D js-es=6 will throw Must call `super()` constructor before accessing `this`

I found is this line cause for error. target for js

haxe version: 4.1.5 or haxe nightly build .

```haxe
f.meta.push({name: ":keep", pos: Context.currentPos()});
```

```haxe
import haxe.macro.Type.ClassType;
import haxe.macro.Context;
import haxe.macro.Expr;

@:remove @:autoBuild(CCG.buildFields())
extern interface CCGen {}

class CCG {
static var inClass:ClassType;

macro public static function buildFields():Array {
var fields:Array = Context.getBuildFields();

for (f in fields) {
f.meta.push({name: ":keep", pos: Context.currentPos()});
}

return fields;
}
}
```

```haxe
import CCG.CCGen;

extern class Component {
function new();
}

class Main extends Component implements CCGen {
@:property
public var arrayFloat:Array = [];

public static function main() {}
}
```

Reproduce the example with Haxe 4.1.5 or a nightly build using -D js-es=6, focusing on the CCG.buildFields macro and its f.meta.push call. Check the generated JavaScript and compiler handling of the macro-added :keep metadata; done means the provided example no longer produces the super() before this error.

Written by the indexing model from the issue text.