Fix redundant constaints warnings with Box types

Author: therealbnut

benchmark/single-source/DictTest.swift

@@ -157,7 +157,7 @@ class Box<T : Hashable> : Hashable {
     return value.hashValue
   }
 
-  static func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
+  static func ==(lhs: Box, rhs: Box) -> Bool {
     return lhs.value == rhs.value
   }
 }

benchmark/single-source/DictTest2.swift

@@ -37,7 +37,7 @@ public func run_Dictionary2(_ N: Int) {
   CheckResults(res == ref_result, "Incorrect results in Dictionary2: \(res) != \(ref_result)")
 }
 
-class Box<T : Hashable> : Hashable where T : Equatable {
+class Box<T : Hashable> : Hashable {
   var value: T
 
   init(_ v: T) {
@@ -48,7 +48,7 @@ class Box<T : Hashable> : Hashable where T : Equatable {
     return value.hashValue
   }
 
-  static func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
+  static func ==(lhs: Box, rhs: Box) -> Bool {
     return lhs.value == rhs.value
   }
 }

benchmark/single-source/DictTest3.swift

@@ -54,13 +54,10 @@ class Box<T : Hashable> : Hashable {
   var hashValue: Int {
     return value.hashValue
   }
-}
-
-extension Box : Equatable {
-}
-
-func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
-  return lhs.value == rhs.value
+  
+  static func ==(lhs: Box, rhs: Box) -> Bool {
+    return lhs.value == rhs.value
+  }
 }
 
 @inline(never)

benchmark/single-source/DictionaryRemove.swift

@@ -53,7 +53,7 @@ class Box<T : Hashable> : Hashable {
     return value.hashValue
   }
 
-  static func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
+  static func ==(lhs: Box, rhs: Box) -> Bool {
     return lhs.value == rhs.value
   }
 }

benchmark/single-source/DictionarySwap.swift

@@ -56,7 +56,7 @@ class Box<T : Hashable> : Hashable {
     return value.hashValue
   }
 
-  static func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
+  static func ==(lhs: Box, rhs: Box) -> Bool {
     return lhs.value == rhs.value
   }
 }

benchmark/single-source/RGBHistogram.swift

@@ -124,7 +124,7 @@ class Box<T : Hashable> : Hashable {
     return value.hashValue
   }
 
-  static func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
+  static func ==(lhs: Box, rhs: Box) -> Bool {
     return lhs.value == rhs.value
   }
 }

benchmark/single-source/SetTests.swift

@@ -115,7 +115,7 @@ class Box<T : Hashable> : Hashable {
     return value.hashValue
   }
 
-  static func ==<T: Equatable>(lhs: Box<T>, rhs: Box<T>) -> Bool {
+  static func ==(lhs: Box, rhs: Box) -> Bool {
     return lhs.value == rhs.value
   }
 }