FIR: add IR text test for overrides generation

compiler/testData/ir/irText/firProblems/ArrayListOverrides.kt

@@ -0,0 +1,8 @@
+// FULL_JDK
+// SKIP_KLIB_TEST
+
+class A1 : java.util.ArrayList<String>()
+
+class A2 : java.util.ArrayList<String>() {
+    override fun remove(x: String): Boolean = true
+}