[box-tests] Added a multi-module box test

compiler/testData/codegen/boxInline/property/reifiedValMultiModule.kt

@@ -0,0 +1,18 @@
+// WITH_STDLIB
+// WITH_REFLECT
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+inline val <reified T: Any> T.value: String
+    get() = T::class.simpleName!!
+
+// MODULE: main(lib)
+// FILE: box.kt
+import lib.*
+
+class OK
+
+fun box(): String {
+    return OK().value ?: "fail"
+}