j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/constructors/parameterModification.kt

@@ -0,0 +1,30 @@
+// ERROR: Overload resolution ambiguity:  internal fun C(arg1: kotlin.Int, arg2: kotlin.Int): C defined in root package public constructor C(arg1: kotlin.Int, arg2: kotlin.Int = ..., arg3: kotlin.Int = ...) defined in C
+fun C(arg1: Int, arg2: Int): C {
+    var arg2 = arg2
+    val __ = C(arg1, arg2, 0)
+    arg2++
+    return __
+}
+
+class C(arg1: Int, arg2: Int = 0, arg3: Int = 0) {
+    private val field: Int
+
+    {
+        var arg1 = arg1
+        var arg3 = arg3
+        arg1++
+        System.out.print(arg1 + arg2)
+        field = arg3
+        arg3++
+    }
+}
+
+public class User {
+    class object {
+        public fun main() {
+            val c1 = C(100, 100, 100)
+            val c2 = C(100, 100)
+            val c3 = C(100)
+        }
+    }
+}