Revert "Revert "[gardening][NSLocale] Move operators into types""

Author: ikesyo

Foundation/NSLocale.swift

@@ -236,12 +236,14 @@ extension NSLocale {
 }
 
 
-public func ==(_ lhs: NSLocale.Key, _ rhs: NSLocale.Key) -> Bool {
-    return lhs.rawValue == rhs.rawValue
-}
+extension NSLocale.Key {
+    public static func ==(_ lhs: NSLocale.Key, _ rhs: NSLocale.Key) -> Bool {
+        return lhs.rawValue == rhs.rawValue
+    }
 
-public func <(_ lhs: NSLocale.Key, _ rhs: NSLocale.Key) -> Bool {
-    return lhs.rawValue < rhs.rawValue
+    public static func <(_ lhs: NSLocale.Key, _ rhs: NSLocale.Key) -> Bool {
+        return lhs.rawValue < rhs.rawValue
+    }
 }