Update a few tests for the "final class" change.

Author: DougGregor

test/Constraints/ErrorBridging.swift

@@ -75,7 +75,7 @@ func throwErrorCode() throws {
   throw FictionalServerError.meltedDown // expected-error{{thrown error code type 'FictionalServerError.Code' does not conform to 'Error'; construct an 'FictionalServerError' instance}}{{29-29=(}}{{40-40=)}}
 }
 
-class MyErrorClass { }
+class MyErrorClass { } // expected-warning{{non-final class 'MyErrorClass' cannot conform to `ConcurrentValue`; use `UnsafeConcurrentValue`}}
 extension MyErrorClass: Error { }
 
 class MyClass { }

test/Constraints/casts.swift

@@ -346,7 +346,7 @@ extension Int: JSONLeaf { }
 extension Array: JSON where Element: JSON { }
 
 protocol SR13035Error: Error {}
-class ChildError: SR13035Error {}
+class ChildError: SR13035Error {} // expected-warning{{non-final class 'ChildError' cannot conform to `ConcurrentValue`; use `UnsafeConcurrentValue`}}
 
 protocol AnyC {
   func foo()