[stdlib] Disable failing Lazy.swift.gyb test again

rdar://31897334

Author: aschwaighofer

validation-test/stdlib/Lazy.swift.gyb

@@ -12,10 +12,11 @@
 // RUN: %target-run-simple-swiftgyb
 // REQUIRES: executable_test
 
+// REQUIRES: radar_31897334
+
 import StdlibUnittest
 import StdlibCollectionUnittest
 
-
 % from gyb_stdlib_support import TRAVERSALS, collectionForTraversal
 
 var LazyTestSuite = TestSuite("Lazy")