Replace math.h with cmath

src/fixed-dtoa.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
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-#include <math.h>
+#include <cmath>
 
 #include "../include/v8stdint.h"
 #include "checks.h"
 #include "utils.h"
 
 #include "double.h"
 #include "fixed-dtoa.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 359 matching lines @@
   buffer[*length] = '\0';
   if ((*length) == 0) {
     // The string is empty and the decimal_point thus has no importance. Mimick
     // Gay's dtoa and and set it to -fractional_count.
     *decimal_point = -fractional_count;
   }
   return true;
 }
 
 } }  // namespace v8::internal