Revert of Remove obsolete V8_INFINITY macro.

test/cctest/compiler/test-machine-operator-reducer.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/cctest.h"
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/codegen.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-graph.h"
@@ skipping 777 matching lines @@
   ReducerTester R;
   R.binop = R.machine.Float64Mul();
 
   FOR_FLOAT64_INPUTS(pl) {
     FOR_FLOAT64_INPUTS(pr) {
       double x = *pl, y = *pr;
       R.CheckFoldBinop<double>(x * y, x, y);
     }
   }
 
-  double inf = std::numeric_limits<double>::infinity();
+  double inf = V8_INFINITY;
   R.CheckPutConstantOnRight(-inf);
   R.CheckPutConstantOnRight(-0.1);
   R.CheckPutConstantOnRight(0.1);
   R.CheckPutConstantOnRight(inf);
 
   Node* x = R.Parameter();
   Node* one = R.Constant<double>(1.0);
 
   R.CheckBinop(x, x, one);  // x * 1.0 => x
   R.CheckBinop(x, one, x);  // 1.0 * x => x
@@ skipping 55 matching lines @@
 // TODO(titzer): test MachineOperatorReducer for Int64Mul
 // TODO(titzer): test MachineOperatorReducer for Int64UMul
 // TODO(titzer): test MachineOperatorReducer for Int64Div
 // TODO(titzer): test MachineOperatorReducer for Uint64Div
 // TODO(titzer): test MachineOperatorReducer for Int64Mod
 // TODO(titzer): test MachineOperatorReducer for Uint64Mod
 // TODO(titzer): test MachineOperatorReducer for Int64Neg
 // TODO(titzer): test MachineOperatorReducer for ChangeInt32ToFloat64
 // TODO(titzer): test MachineOperatorReducer for ChangeFloat64ToInt32
 // TODO(titzer): test MachineOperatorReducer for Float64Compare