The difference is that JVM_IR generates line numbers for the
constructor field initialization.
In this case:
```
29: class B {
30: // comment
31: val bPropVal: Int,
32: // comment
33: var bProbVar: Int
34: ) {
```
the line numbers for the field initializations are 31 and 33 where
in the current backend the whole constructor has line number 29.