Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/jvmOverloads/generics.kt

@@ -0,0 +1,18 @@
+// FILE: Test.java
+
+public class Test {
+    public static String invokeMethodWithOverloads() {
+        C<String> c = new C<String>();
+        return c.foo("O");
+    }
+}
+
+// FILE: generics.kt
+
+class C<T> {
+    @kotlin.jvm.JvmOverloads public fun foo(o: T, k: String = "K"): String = o.toString() + k
+}
+
+fun box(): String {
+    return Test.invokeMethodWithOverloads()
+}

compiler/testData/codegen/boxWithJava/jvmOverloads/generics/Test.java

@@ -1,6 +0,0 @@
-public class Test {
-    public static String invokeMethodWithOverloads() {
-        C<String> c = new C<String>();
-        return c.foo("O");
-    }
-}

compiler/testData/codegen/boxWithJava/jvmOverloads/generics/generics.kt

@@ -1,7 +0,0 @@
-class C<T> {
-    @kotlin.jvm.JvmOverloads public fun foo(o: T, k: String = "K"): String = o.toString() + k
-}
-
-fun box(): String {
-    return Test.invokeMethodWithOverloads()
-}

compiler/testData/codegen/boxWithJava/jvmOverloads/simple.kt

@@ -1,3 +1,14 @@
+// FILE: Test.java
+
+public class Test {
+    public static String invokeMethodWithOverloads() {
+        C c = new C();
+        return c.foo();
+    }
+}
+
+// FILE: simple.kt
+
 class C {
     @kotlin.jvm.JvmOverloads public fun foo(o: String = "O", k: String = "K"): String = o + k
 }

compiler/testData/codegen/boxWithJava/jvmOverloads/simple/Test.java

@@ -1,6 +0,0 @@
-public class Test {
-    public static String invokeMethodWithOverloads() {
-        C c = new C();
-        return c.foo();
-    }
-}