hxb vs. exception stack positions (I think)

```haxe
import haxe.exceptions.NotImplementedException;

function throwing() {
throw new NotImplementedException();
}

function syncFun2() {
throwing();
}

function syncFun1() {
syncFun2();
}

function main() {
try {
syncFun1();
} catch(e:NotImplementedException) {
trace(e.stack);
}
}
```

```
PS C:\git\haxerepro> haxe -cp source --main Main --jvm export/run.jar --hxb export/run.hxb
PS C:\git\haxerepro> java -jar export/run.jar
source/Main.hx:19:
Called from _Main.Main_Fields_.throwing (source/Main.hx line 4)
Called from _Main.Main_Fields_.syncFun2 (source/Main.hx line 8)
Called from _Main.Main_Fields_.syncFun1 (source/Main.hx line 12)
Called from _Main.Main_Fields_.main (source/Main.hx line 17)
Called from _Main.Main_Fields_.main (source/Main.hx line 0)
PS C:\git\haxerepro> haxe --hxb-lib export/run.hxb --main Main --jvm export/run.jar
PS C:\git\haxerepro> java -jar export/run.jar
source/Main.hx:19:
Called from _Main.Main_Fields_.throwing (source/Main.hx line -1)
Called from _Main.Main_Fields_.syncFun2 (source/Main.hx line -1)
Called from _Main.Main_Fields_.syncFun1 (source/Main.hx line -1)
Called from _Main.Main_Fields_.main (source/Main.hx line -1)
Called from _Main.Main_Fields_.main (source/Main.hx line 0)
```

I don't know the scope of this yet but we're somehow losing positions.