[Test] KT-61360: add tests for the IrFakeOverrideBuilder

Add tests for fake overrides with focus on java interoperability

Co-authored-by: Aleksandra Arsenteva <aleksandra.arsenteva@jetbrains.com>

compiler/testData/ir/irText/fakeOverrides/collections/map/intersectionWithGenericMapOverrideKJJ.kt

@@ -0,0 +1,35 @@
+// TARGET_BACKEND: JVM
+// FULL_JDK
+// WITH_STDLIB
+// SEPARATE_SIGNATURE_DUMP_FOR_K2
+// ^ ISSUE: KT-65667
+
+// FILE: 1.kt
+import java.util.HashMap
+import java.util.SortedMap
+
+abstract class A<T> : SortedMap<T, T>, HashMap<T, T>()
+
+abstract class B<T> : SortedMap<T, T>, HashMap<T, T>() {
+    override fun put(key: T, value: T): T? {
+        return null!!
+    }
+
+    override fun remove(key: T): T {
+        return null!!
+    }
+}
+
+fun test(a: A<Boolean>, b: B<Boolean?>) {
+    a.size
+    a[true] = true
+    a.put(null, null)
+    a.get(true)
+    a.get(null)
+    a.remove(null)
+    a.remove(true)
+
+    b.put(false, false)
+    b[true] = true
+    b.remove(null)
+}