Don't generate delegates on overriding jvm8 interfaces

compiler/testData/codegen/java8/box/jvm8/simpleCall.kt

@@ -0,0 +1,14 @@
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.JVM_8_TARGET
+interface Test {
+    fun test(): String {
+        return "OK"
+    }
+}
+
+class TestClass : Test {
+
+}
+
+fun box(): String {
+    return TestClass().test()
+}