Put 'thisReceiver' declaration in class

Interfaces also have 'thisReceiver'

compiler/testData/ir/irText/expressions/multipleThisReferences.kt

@@ -0,0 +1,9 @@
+class Outer {
+    open inner class Inner(val x: Int)
+}
+
+class Host(val y: Int) {
+    fun Outer.test() = object : Outer.Inner(42) {
+        val xx = x + y
+    }
+}