Fixing tests

Author: LucianoPAlmeida

test/Constraints/bridging.swift

@@ -285,7 +285,7 @@ func rdar19836341(_ ns: NSString?, vns: NSString?) {
 
 // <rdar://problem/20029786> Swift compiler sometimes suggests changing "as!" to "as?!"
 func rdar20029786(_ ns: NSString?) {
-  var s: String = ns ?? "str" as String as String // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{19-19=(}} {{50-50=) as String}}
+  var s: String = ns ?? "str" as String as String // expected-error{{'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?}} {{19-19=(}} {{50-50=) as String}} expected-warning {{redundant cast to 'String' has no effect}} {{41-51=}}
   // expected-error@-1 {{cannot convert value of type 'String' to expected argument type 'NSString'}} {{50-50= as NSString}}
   var s2 = ns ?? "str" as String as String // expected-error {{cannot convert value of type 'String' to expected argument type 'NSString'}}{{43-43= as NSString}} expected-warning {{redundant cast to 'String' has no effect}} {{34-44=}}