Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/call/simpleTopLevelFunctions.kt

@@ -0,0 +1,29 @@
+// WITH_REFLECT
+
+fun String.foo(): Int = length
+
+var state = "Fail"
+
+fun bar(result: String) {
+    state = result
+}
+
+fun box(): String {
+    val f = (String::foo).call("abc")
+    if (f != 3) return "Fail: $f"
+
+    try {
+        (String::foo).call()
+        return "Fail: IllegalArgumentException should have been thrown"
+    }
+    catch (e: IllegalArgumentException) {}
+
+    try {
+        (String::foo).call(42)
+        return "Fail: IllegalArgumentException should have been thrown"
+    }
+    catch (e: IllegalArgumentException) {}
+
+    (::bar).call("OK")
+    return state
+}