Revert of Remove obsolete V8_INFINITY macro.

src/conversions-inl.h

Index: src/conversions-inl.h
diff --git a/src/conversions-inl.h b/src/conversions-inl.h
index e09165044ddc5b43bbf4da48ef4e0bda916d3d56..ae87dc4d31b01763eef756a1058a05ca0dc1561e 100644
--- a/src/conversions-inl.h
+++ b/src/conversions-inl.h
@@ -5,9 +5,11 @@
 #ifndef V8_CONVERSIONS_INL_H_
 #define V8_CONVERSIONS_INL_H_
 
+#include <float.h>         // Required for DBL_MAX and on Win32 for finite()
+#include <limits.h>        // Required for INT_MAX etc.
+#include <stdarg.h>
 #include <cmath>
-#include <cstdarg>
-#include <limits>
+#include "src/globals.h"       // Required for V8_INFINITY
 
 // ----------------------------------------------------------------------------
 // Extra POSIX/ANSI functions for Win32/MSVC.
@@ -481,8 +483,7 @@
     }
 
     DCHECK(buffer_pos == 0);
-    return (sign == NEGATIVE) ? -std::numeric_limits<double>::infinity()
-                              : std::numeric_limits<double>::infinity();
+    return (sign == NEGATIVE) ? -V8_INFINITY : V8_INFINITY;
   }
 
   bool leading_zero = false;
@@ -642,7 +643,7 @@
       }
     }
 
-    const int max_exponent = std::numeric_limits<int>::max() / 2;
+    const int max_exponent = INT_MAX / 2;
     DCHECK(-max_exponent / 2 <= exponent && exponent <= max_exponent / 2);
     int num = 0;
     do {