Fixed problem with overriding method with non-trivial raw type (when erased type parameter has upper bound)

Also added cases for the code which was changed.

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

@@ -0,0 +1,15 @@
+//FILE: Foo.java
+public class Foo<T extends CharSequence> {
+}
+
+//FILE: Bar.java
+public interface Bar {
+    void f(Foo f);
+}
+
+//FILE: a.kt
+class BarImpl: Bar {
+    override fun f(f: Foo<out CharSequence?>?) {
+        throw UnsupportedOperationException()
+    }
+}