Merge boxWithJava testData into box, delete BoxWithJava test

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

@@ -0,0 +1,32 @@
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    public static String nullString() {
+        return null;
+    }
+
+    public static String nonnullString() {
+        return "OK";
+    }
+
+}
+
+// FILE: kotlin.kt
+
+fun box(): String {
+    val nullStr = JavaClass.nullString()
+    val nonnullStr = JavaClass.nonnullString()
+
+    if (nullStr.foo() != null) return "fail 1"
+    if (nonnullStr.foo() != nonnullStr) return "fail 2"
+
+    if (nullStr.fooN() != null) return "fail 3"
+    if (nonnullStr.fooN() != nonnullStr) return "fail 4"
+
+    return "OK"
+}
+
+inline fun <reified T> T.foo(): T = this as T
+
+inline fun <reified T> T.fooN(): T? = this as T?

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

@@ -0,0 +1,32 @@
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    public static String nullString() {
+        return null;
+    }
+
+    public static String nonnullString() {
+        return "OK";
+    }
+
+}
+
+// FILE: kotlin.kt
+
+fun box(): String {
+    val nullStr = JavaClass.nullString()
+    val nonnullStr = JavaClass.nonnullString()
+
+    if (nullStr.foo() != true) return "fail 1"
+    if (nonnullStr.foo() != true) return "fail 2"
+
+    if (nullStr.fooN() != true) return "fail 3"
+    if (nonnullStr.fooN() != true) return "fail 4"
+
+    return "OK"
+}
+
+inline fun <reified T> T.foo(): Boolean = this is T
+
+inline fun <reified T> T.fooN(): Boolean = this is T?