[Foundation] URLComponents: Modernize hashing

Author: lorentey

Darwin/Foundation-swiftoverlay/URLComponents.swift

@@ -292,8 +292,8 @@ public struct URLComponents : ReferenceConvertible, Hashable, Equatable, _Mutabl
         set { _applyMutation { $0.percentEncodedQueryItems = newValue } }
     }
 
-    public var hashValue: Int {
-        return _handle.map { $0.hash }
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(_handle._uncopiedReference())
     }
 
     // MARK: - Bridging
@@ -404,7 +404,9 @@ public struct URLQueryItem : ReferenceConvertible, Hashable, Equatable {
         set { _queryItem = NSURLQueryItem(name: name, value: newValue) }
     }
 
-    public var hashValue: Int { return _queryItem.hash }
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(_queryItem)
+    }
 
     @available(macOS 10.10, iOS 8.0, *)
     public static func ==(lhs: URLQueryItem, rhs: URLQueryItem) -> Bool {