Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/reflection/callStaticJavaMethod.kt

@@ -0,0 +1,22 @@
+// FILE: J.java
+
+public class J {
+    public static String foo(int x, int[] arr, Object[] arr2) {
+        return "" + x + arr[0] + arr2[0];
+    }
+}
+
+// FILE: K.kt
+
+import kotlin.reflect.jvm.*
+import kotlin.test.assertEquals
+
+fun box(): String {
+    val f = J::foo
+    assertEquals(listOf(Integer.TYPE, IntArray::class.java, Array<Any>::class.java), f.parameters.map { it.type.javaType })
+    assertEquals(String::class.java, f.returnType.javaType)
+
+    assertEquals("01A", f.call(0, intArrayOf(1), arrayOf("A")))
+
+    return "OK"
+}