Fix captured approximation for case of flexible types

#KT-9294 Fixed

compiler/testData/diagnostics/tests/generics/projectionsScope/platformSuperClass.kt

@@ -0,0 +1,22 @@
+// !CHECK_TYPE
+
+// FILE: Clazz.java
+public class Clazz<T> {
+    public T getT() { return null; }
+    public Clazz<? super T> getSuperClass() { return null; }
+}
+
+// FILE: main.kt
+fun test(clazz: Clazz<*>) {
+    clazz.t checkType { _<Any?>() }
+    clazz.getSuperClass() checkType { _<Clazz<*>?>() }
+    clazz.getSuperClass().t checkType { _<Any?>() }
+
+    clazz.superClass checkType { _<Clazz<*>?>() }
+    clazz.superClass.t checkType { _<Any?>() }
+
+    // See KT-9294
+    if (clazz.superClass == null) {
+        throw NullPointerException()
+    }
+}