[JVM] Extend stepping tests with <clinit> stepping.

In addition, made the stepping information for constructor calls
consistent across JVM_IR and JVM. For JVM_IR that stepping behavior
is consistent for enum constructor calls in <clinit> for JVM it
is not.

compiler/testData/debug/stepping/classObject.kt

@@ -23,6 +23,8 @@ fun box() {
 
 // LINENUMBERS
 // test.kt:14 box
+// test.kt:5 <clinit>
+// test.kt:6 <clinit>
 // test.kt:5 getProp0
 // LINENUMBERS JVM
 // test.kt:5 getProp0