[intrinsics] Kill the %_IsMinusZero intrinsic.

test/cctest/compiler/test-run-intrinsics.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/cctest/compiler/function-tester.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 86 matching lines @@
   T.CheckFalse(T.NewObject("([1])"));
   T.CheckFalse(T.NewObject("({})"));
   T.CheckFalse(T.NewObject("(/x/)"));
   T.CheckFalse(T.undefined());
   T.CheckFalse(T.null());
   T.CheckFalse(T.Val("x"));
   T.CheckFalse(T.Val(1));
 }
 
 
-TEST(IsMinusZero) {
-  FunctionTester T("(function(a) { return %_IsMinusZero(a); })", flags);
-
-  T.CheckFalse(T.Val(1));
-  T.CheckFalse(T.Val(1.1));
-  T.CheckTrue(T.Val(-0.0));
-  T.CheckFalse(T.Val(-2));
-  T.CheckFalse(T.Val(-2.3));
-  T.CheckFalse(T.undefined());
-}
-
-
 TEST(IsRegExp) {
   FunctionTester T("(function(a) { return %_IsRegExp(a); })", flags);
 
   T.CheckFalse(T.NewObject("new Date()"));
   T.CheckFalse(T.NewObject("(function() {})"));
   T.CheckFalse(T.NewObject("([1])"));
   T.CheckFalse(T.NewObject("({})"));
   T.CheckTrue(T.NewObject("(/x/)"));
   T.CheckFalse(T.undefined());
   T.CheckFalse(T.null());
@@ skipping 163 matching lines @@
 
   T.CheckCall(T.Val("a"), T.Val("a"));
   T.CheckCall(T.Val("b"), T.NewObject("(new String('b'))"));
   T.CheckCall(T.Val(123), T.Val(123));
   T.CheckCall(T.Val(456), T.NewObject("(new Number(456))"));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8