Add REQUIRES: deterministic-behavior to a new crasher that does not always crash.

Author: rudkx

validation-test/compiler_crashers/28698-isactuallycanonicalornull-forming-a-cantype-out-of-a-non-canonical-type.swift

@@ -5,6 +5,8 @@
 // See https://swift.org/LICENSE.txt for license information
 // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
+// REQUIRES: deterministic-behavior
+
 // REQUIRES: asserts
 // RUN: not --crash %target-swift-frontend %s -emit-ir
 {func c(UInt=1 + 1 as?Int){b