Fix test for IndexDistance removal

Author: DougGregor

stdlib/public/core/Collection.swift

@@ -358,7 +358,7 @@ public protocol Collection: Sequence where SubSequence: Collection {
   /// "past the end" position that's not valid for use as a subscript
   /// argument.
   associatedtype Index : Comparable
-  
+
   /// The position of the first element in a nonempty collection.
   ///
   /// If the collection is empty, `startIndex` is equal to `endIndex`.

test/Constraints/diagnostics.swift

@@ -161,7 +161,7 @@ func rdar20142523() {
 // <rdar://problem/21080030> Bad diagnostic for invalid method call in boolean expression: (_, ExpressibleByIntegerLiteral)' is not convertible to 'ExpressibleByIntegerLiteral
 func rdar21080030() {
   var s = "Hello"
-  if s.count() == 0 {} // expected-error{{cannot call value of non-function type 'String.IndexDistance' (aka 'Int')}}{{13-15=}}
+  if s.count() == 0 {} // expected-error{{cannot call value of non-function type 'Int'}}{{13-15=}}
 }
 
 // <rdar://problem/21248136> QoI: problem with return type inference mis-diagnosed as invalid arguments