JS: serialize type of local anonymous class as its denotable supertype. See KT-14888

js/js.translator/testData/box/multiModule/localClassMetadata.kt

@@ -0,0 +1,45 @@
+// MODULE: lib
+// FILE: lib.kt
+
+interface I {
+    fun foo(): String
+}
+
+abstract class A {
+    abstract fun bar(): String
+}
+
+abstract class G<T> {
+    abstract fun baz(): T
+}
+
+class C {
+    private val propA = object : A() {
+        override fun bar() = "propA.bar"
+    }
+
+    private val propI = object : I {
+        override fun foo() = "propI.foo"
+    }
+
+    private val propAI = object : A(), I {
+        override fun foo() = "propAI.foo"
+
+        override fun bar() = "propAI.bar"
+    }
+
+    private val propG = object : G<String>() {
+        override fun baz() = "propG.baz"
+    }
+
+    fun test() = "${propA.bar()};${propI.foo()};${propAI.foo()};${propAI.bar()};${propG.baz()}"
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+fun box(): String {
+    val result = C().test()
+    if (result != "propA.bar;propI.foo;propAI.foo;propAI.bar;propG.baz") return "fail: $result"
+
+    return "OK"
+}