New J2K: Split old j2k and new j2k tests

nj2k/testData/newJ2k/function/parameterModification.kt

@@ -0,0 +1,7 @@
+fun foo(p1: Int, p2: Int, p3: Int): Int {
+    var p1 = p1
+    var p3 = p3
+    p1++
+    if (p2 > 0) p3 = 0
+    return p1 + p2 + p3
+}