Revert of Remove obsolete V8_INFINITY macro.

src/strtod.cc

Index: src/strtod.cc
diff --git a/src/strtod.cc b/src/strtod.cc
index 4f06b3979d976b914bf1b3bda59e5cb100a8c801..2b48af3cc60c93aeaadc9660d2e5e77c99268896 100644
--- a/src/strtod.cc
+++ b/src/strtod.cc
@@ -2,9 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <stdarg.h>
 #include <cmath>
-#include <cstdarg>
-#include <limits>
 
 #include "src/v8.h"
 
@@ -353,7 +352,7 @@
 static double BignumStrtod(Vector<const char> buffer,
                            int exponent,
                            double guess) {
-  if (guess == std::numeric_limits<double>::infinity()) {
+  if (guess == V8_INFINITY) {
     return guess;
   }
 
@@ -409,9 +408,7 @@
                                      kMaxSignificantDecimalDigits),
                   significant_exponent);
   }
-  if (exponent + trimmed.length() - 1 >= kMaxDecimalPower) {
-    return std::numeric_limits<double>::infinity();
-  }
+  if (exponent + trimmed.length() - 1 >= kMaxDecimalPower) return V8_INFINITY;
   if (exponent + trimmed.length() <= kMinDecimalPower) return 0.0;
 
   double guess;