Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/protectedInInline.kt

@@ -0,0 +1,19 @@
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    protected String FIELD = "OK";
+
+}
+
+// FILE: Kotlin.kt
+
+package test
+
+import JavaClass
+
+class B : JavaClass() {
+    inline fun bar() = FIELD
+}
+
+fun box() = B().bar()