Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/reified/asCheck.kt

@@ -1,3 +1,19 @@
+// 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()
@@ -13,4 +29,4 @@ fun box(): String {
 
 inline fun <reified T> T.foo(): T = this as T
 
-inline fun <reified T> T.fooN(): T? = this as T?
+inline fun <reified T> T.fooN(): T? = this as T?

compiler/testData/codegen/boxWithJava/reified/asCheck/JavaClass.java

@@ -1,11 +0,0 @@
-public class JavaClass {
-
-    public static String nullString() {
-        return null;
-    }
-
-    public static String nonnullString() {
-        return "OK";
-    }
-
-}

compiler/testData/codegen/boxWithJava/reified/isCheck.kt

@@ -1,3 +1,19 @@
+// 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()
@@ -13,4 +29,4 @@ fun box(): String {
 
 inline fun <reified T> T.foo(): Boolean = this is T
 
-inline fun <reified T> T.fooN(): Boolean = this is T?
+inline fun <reified T> T.fooN(): Boolean = this is T?

compiler/testData/codegen/boxWithJava/reified/isCheck/JavaClass.java

@@ -1,11 +0,0 @@
-public class JavaClass {
-
-    public static String nullString() {
-        return null;
-    }
-
-    public static String nonnullString() {
-        return "OK";
-    }
-
-}