Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/casts/functions/reifiedIsFunKSmall.kt

@@ -0,0 +1,38 @@
+// WITH_RUNTIME
+
+fun fn0() {}
+fun fn1(x: Any) {}
+
+inline fun <reified T> assertReifiedIs(x: Any, type: String) {
+    val answer: Boolean
+    try {
+        answer = x is T
+    }
+    catch (e: Throwable) {
+        throw AssertionError("$x is $type: should not throw exceptions, got $e")
+    }
+    assert(answer) { "$x is $type: failed" }
+}
+
+inline fun <reified T> assertReifiedIsNot(x: Any, type: String) {
+    val answer: Boolean
+    try {
+        answer = x !is T
+    }
+    catch (e: Throwable) {
+        throw AssertionError("$x !is $type: should not throw exceptions, got $e")
+    }
+    assert(answer) { "$x !is $type: failed" }
+}
+
+fun box(): String {
+    val f0 = ::fn0 as Any
+    val f1 = ::fn1 as Any
+
+    assertReifiedIs<Function0<*>>(f0, "Function0<*>")
+    assertReifiedIs<Function1<*, *>>(f1, "Function1<*, *>")
+    assertReifiedIsNot<Function0<*>>(f1, "Function0<*>")
+    assertReifiedIsNot<Function1<*, *>>(f0, "Function1<*, *>")
+
+    return "OK"
+}