Kapt: Fix "Anonymous class types are not rendered properly in stubs" (KT-18682)

plugins/kapt3/testData/converter/kt18682.kt

@@ -0,0 +1,25 @@
+// WITH_RUNTIME
+
+fun test1() = (0..10).map { n ->
+    object {
+        override fun hashCode() = n
+    }
+}
+
+fun test2() = (0..10).map { n ->
+    object : Runnable {
+        override fun run() {}
+    }
+}
+
+abstract class Foo
+
+fun test3() = (0..10).map { n ->
+    object : Foo() {}
+}
+
+fun test4() = (0..10).map { n ->
+    object : Foo(), Runnable {
+        override fun run() {}
+    }
+}

plugins/kapt3/testData/converter/kt18682.txt

@@ -0,0 +1,38 @@
+@kotlin.Metadata()
+public abstract class Foo {
+
+    public Foo() {
+        super();
+    }
+}
+
+////////////////////
+
+
+@kotlin.Metadata()
+public final class Kt18682Kt {
+
+    public Kt18682Kt() {
+        super();
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public static final java.util.List<java.lang.Object> test1() {
+        return null;
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public static final java.util.List<java.lang.Runnable> test2() {
+        return null;
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public static final java.util.List<Foo> test3() {
+        return null;
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public static final java.util.List<Foo> test4() {
+        return null;
+    }
+}