[FIR] Relax intersection overrides visibility requirements for Java

Allow multiple bases with default
implementations as long as there's a
non-abstract symbol from a class.

Our rules for Kotlin are stricter than
those in Java.

compiler/testData/diagnostics/tests/intersectionWithMultipleDefaultsInJava.fir.kt

@@ -1,34 +0,0 @@
-// TARGET_BACKEND: JVM
-
-// FILE: IntCollection.java
-interface IntCollection<E> {
-    public boolean add(int key);
-}
-
-// FILE: IntSet.java
-interface IntSet extends IntCollection {
-    public default boolean add(Integer it) { return true; }
-
-    // from the supertype
-    // public boolean add(int key);
-}
-
-// FILE: AbstractCollection.java
-abstract class AbstractCollection<E> {
-    public boolean add(E it) { return true; }
-}
-
-// FILE: AbstractIntCollection.java
-abstract class AbstractIntCollection extends AbstractCollection<Integer> {
-    public boolean add(int it) { return true; }
-
-    // from the supertype
-    // public default boolen add(Integer it) { return true; }
-}
-
-// FILE: AbstractIntSet.java
-public abstract class AbstractIntSet extends AbstractIntCollection implements IntSet {}
-
-// FILE: Main.kt
-
-<!CANNOT_INFER_VISIBILITY!>class KotlinClass<!> : AbstractIntSet()

compiler/testData/diagnostics/tests/intersectionWithMultipleDefaultsInJava.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // TARGET_BACKEND: JVM
 
 // FILE: IntCollection.java