Merge boxWithStdlib testData into box, delete BoxWithStdlib test

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

@@ -0,0 +1,36 @@
+// WITH_RUNTIME
+
+fun fn0() {}
+fun fn1(x: Any) {}
+
+inline fun safeAsReturnsNull(operation: String, cast: () -> Any?) {
+    try {
+        val x = cast()
+        assert(x == null) { "$operation: should return null, got $x" }
+    }
+    catch (e: Throwable) {
+        throw AssertionError("$operation: should not throw exceptions, got $e")
+    }
+}
+
+inline fun safeAsReturnsNonNull(operation: String, cast: () -> Any?) {
+    try {
+        val x = cast()
+        assert(x != null) { "$operation: should return non-null" }
+    }
+    catch (e: Throwable) {
+        throw AssertionError("$operation: should not throw exceptions, got $e")
+    }
+}
+
+fun box(): String {
+    val f0 = ::fn0 as Any
+    val f1 = ::fn1 as Any
+
+    safeAsReturnsNonNull("f0 as? Function0<*>") { f0 as? Function0<*> }
+    safeAsReturnsNull("f0 as? Function1<*, *>") { f0 as? Function1<*, *> }
+    safeAsReturnsNull("f1 as? Function0<*>") { f1 as? Function0<*> }
+    safeAsReturnsNonNull("f1 as? Function1<*, *>") { f1 as? Function1<*, *> }
+
+    return "OK"
+}