This test needs asserts

Fixes rdar://152543008.

Author: slavapestov

validation-test/compiler_crashers_2/issue-81834.swift

@@ -1,5 +1,6 @@
 // RUN: not --crash %target-swift-frontend -typecheck -library-level api %s
 // REQUIRES: OS=macosx
+// REQUIRES: asserts
 
 // https://github.com/swiftlang/swift/issues/81834
 public class C {