Add tests for obsolete issues

(Test for KT-37331 is added to multiplatform/defaultArguments/suspend.kt.)

 #KT-30080
 #KT-33641
 #KT-36237
 #KT-36952
 #KT-37331
 #KT-38920
 #KT-39256
 #KT-42415
 #KT-44636
 #KT-45704
 #KT-47084
 #KT-47894

compiler/testData/codegen/box/reified/kt39256_privateInlineWithAnonymousObject.kt

@@ -0,0 +1,13 @@
+interface I
+class C<T>
+
+private inline fun <reified T> C<T>.f() = object : I {
+    val unused = T::class
+}
+
+fun box(): String {
+    val t1 = C<String>().f()
+    val t2 = C<String>().f()
+    arrayOf(t1, t2)
+    return "OK"
+}