Support DNN types in approximator

Mostly, it's relevant to FIR since there we started loading
type parameter based types as (T & Any..T?)

compiler/testData/diagnostics/tests/j+k/recursiveSelfTypes.kt

@@ -0,0 +1,31 @@
+// FIR_IDENTICAL
+// SKIP_TXT
+// FILE: TSFBuilder.java
+public abstract class TSFBuilder<F extends CharSequence, B extends TSFBuilder<F,B>> {
+    public B configure() { return null; }
+    public abstract F build();
+
+    public static TSFBuilder<?, ?> start() { return null; }
+}
+
+// FILE: test.kt
+
+fun foo(x: CharSequence?) {}
+
+fun main() {
+    foo(
+        TSFBuilder.start()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .configure()
+            .build()
+    )
+}