Merge "diagnostic with Java 8" tests with general diagnostic tests

compiler/testData/diagnostics/tests/targetedBuiltIns/backwardCompatibility/basic.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -PLATFORM_CLASS_MAPPED_TO_KOTLIN
+
+abstract class Test1 : Map<String, String> {
+    fun <!VIRTUAL_MEMBER_HIDDEN!>containsKey<!>(key: String): Boolean = TODO()
+
+    fun getOrDefault(key: String, defaultValue: String): String = TODO()
+}
+
+abstract class Test2 : MutableMap<String, String> {
+    fun replace(key: String, value: String): String? = TODO()
+}
+
+abstract class Test3 : java.util.AbstractMap<String, String>() {
+    fun <!VIRTUAL_MEMBER_HIDDEN!>containsKey<!>(key: String): Boolean = TODO()
+
+    fun replace(key: String, value: String): String? = TODO()
+}
+