Disable 0022-rdar21625478.swift entirely on noassert builds

Fixes rdar://problem/99800538.

Author: slavapestov

validation-test/compiler_crashers_2_fixed/0022-rdar21625478.swift

@@ -3,6 +3,9 @@
 // rdar://80395274 tracks getting this to pass with the requirement machine.
 // XFAIL: *
 
+// The test hangs in a noassert build:
+// REQUIRES: asserts
+
 import StdlibUnittest
 
 public struct MyRange<Bound : ForwardIndex> {