[Foundation] NSRange: Modernize hashing

Author: lorentey

Darwin/Foundation-swiftoverlay/NSRange.swift

@@ -13,14 +13,6 @@
 @_exported import Foundation // Clang module
 
 extension NSRange : Hashable {
-    public var hashValue: Int { // FIXME(hashValue): Remove
-#if arch(i386) || arch(arm)
-        return Int(bitPattern: (UInt(bitPattern: location) | (UInt(bitPattern: length) << 16)))
-#elseif arch(x86_64) || arch(arm64)
-        return Int(bitPattern: (UInt(bitPattern: location) | (UInt(bitPattern: length) << 32)))
-#endif
-    }
-
     public func hash(into hasher: inout Hasher) {
         hasher.combine(location)
         hasher.combine(length)