Move JVM8 box test to common

compiler/testData/codegen/box/jvm8/defaults/defaultArgs.kt

@@ -0,0 +1,17 @@
+// !API_VERSION: 1.3
+// !JVM_DEFAULT_MODE: enable
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// WITH_RUNTIME
+interface Z {
+    @JvmDefault
+    fun test(s: String = "OK"): String {
+        return s
+    }
+}
+
+class Test: Z
+
+fun box(): String {
+    return Test().test()
+}