Constructor with defaulted parameter is interfering with breakpoint location

Consider the following:
```groovy
class One {
  void meth() {
    println 'blah blah'
  }
}

class Two {
  final Map map
  Two(Map map = Collections.EMPTY_MAP) {
    this.map = map
  }
}
```

Attempting to set a breakpoint on line containing `println` results in method entry breakpoint on line containing `Two(Map...`.