Refactor mysterious code in ExpressionCodegen

'super' receiver is now generated in visitSuperExpression()

compiler/testData/codegen/super/innerClassLabeledSuper.kt

@@ -0,0 +1,38 @@
+trait BK {
+    fun foo(): String
+    fun bar(): String
+}
+
+trait K : BK {
+    override fun foo() = bar()
+}
+
+class A : K {
+    override fun foo() = "A.foo"
+    override fun bar() = "A.bar"
+    
+    class B : K {
+        override fun foo() = "B.foo"
+        override fun bar() = "B.bar"
+        
+        fun test1() = super<K>@A.foo()
+        fun test2() = super<K>@B.foo()
+        fun test3() = super<K>.foo()
+        fun test4() = super@A.foo()
+        fun test5() = super@B.foo()
+        fun test6() = super.foo()
+    }
+}
+
+
+fun box(): String {
+    val b = A().B()
+    if (b.test1() != "A.bar") return "test1 ${b.test1()}"
+    if (b.test2() != "B.bar") return "test2 ${b.test2()}"
+    if (b.test3() != "B.bar") return "test3 ${b.test3()}"
+    if (b.test4() != "A.bar") return "test4 ${b.test4()}"
+    if (b.test5() != "B.bar") return "test5 ${b.test5()}"
+    if (b.test6() != "B.bar") return "test6 ${b.test6()}"
+    
+    return "OK"
+}

compiler/testData/codegen/super/innerClassLabeledSuperProperty.kt

@@ -0,0 +1,38 @@
+trait Base {
+    val foo: String
+    fun bar(): String
+}
+
+abstract class K : Base {
+    override val foo = bar()
+}
+
+class A : K() {
+    override val foo = "A.foo"
+    override fun bar() = "A.bar"
+    
+    class B : K() {
+        override val foo = "B.foo"
+        override fun bar() = "B.bar"
+        
+        fun test1() = super<K>@A.foo
+        fun test2() = super<K>@B.foo
+        fun test3() = super<K>.foo
+        fun test4() = super@A.foo
+        fun test5() = super@B.foo
+        fun test6() = super.foo
+    }
+}
+
+
+fun box(): String {
+    val b = A().B()
+    if (b.test1() != "A.bar") return "test1 ${b.test1()}"
+    if (b.test2() != "B.bar") return "test2 ${b.test2()}"
+    if (b.test3() != "B.bar") return "test3 ${b.test3()}"
+    if (b.test4() != "A.bar") return "test4 ${b.test4()}"
+    if (b.test5() != "B.bar") return "test5 ${b.test5()}"
+    if (b.test6() != "B.bar") return "test6 ${b.test6()}"
+    
+    return "OK"
+}

compiler/testData/codegen/super/multipleSuperTraits.kt

@@ -0,0 +1,13 @@
+trait T1 {
+    fun foo() = "O"
+}
+
+trait T2 {
+    fun foo() = "K"
+}
+
+class A : T1, T2 {
+    override fun foo() = super<T1>.foo() + super<T2>.foo()
+}
+
+fun box() = A().foo()