Some tests for override action has been added.

idea/testData/codeInsight/overrideImplement/multiOverride.kt.after

@@ -0,0 +1,14 @@
+trait A {
+    fun foo(value : String) : Int = 0
+    fun bar() : String = "hello"
+}
+
+class C : A {
+
+    override fun bar() : String {
+        return super<A>.bar()
+    }
+    override fun foo(value : String) : Int {
+        return super<A>.foo(value)
+    }
+}