[JVM] Port line number tests to stepping framework.

Allow specifying JVM and JVM_IR as well as shared expectations.

Add the method name to the step.

Discard steps in synthetic methods.

compiler/testData/debug/stepping/simpleDefaultArg.kt

@@ -1,5 +1,5 @@
-
 // FILE: test.kt
+
 fun ifoo(ok: String = "OK"): String {
     return ok
 }
@@ -8,9 +8,10 @@ fun box(): String {
     return ifoo()
 }
 
+// FORCE_STEP_INTO
 // LINENUMBERS
-// test.kt:8
-// test.kt:3
-// test.kt:4
-// test.kt:3
-// test.kt:8
+// test.kt:8 box
+// test.kt:3 ifoo$default (synthetic)
+// test.kt:4 ifoo
+// test.kt:3 ifoo$default (synthetic)
+// test.kt:8 box