[Test] Move KotlinAgainstKotlin tests under BlackBoxCodegen tests

compiler/testData/codegen/box/compileKotlinAgainstKotlin/reflectTopLevelFunctionOtherFile.kt

@@ -0,0 +1,23 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+
+// WITH_REFLECT
+// MODULE: lib
+// FILE: A.kt
+
+fun test() {
+}
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+import kotlin.reflect.jvm.javaMethod
+import kotlin.reflect.jvm.kotlinFunction
+
+fun box(): String {
+    val r = Class.forName("AKt").methods.single { it.name == "test" }.kotlinFunction
+    if (r?.toString() != "fun test(): kotlin.Unit")
+        return "Fail: $r"
+
+    return "OK"
+}