Replace math.h with cmath

src/bignum-dtoa.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
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 //       from this software without specific prior written permission.
 //
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-#include <math.h>
+#include <cmath>
 
 #include "../include/v8stdint.h"
 #include "checks.h"
 #include "utils.h"
 
 #include "bignum-dtoa.h"
 
 #include "bignum.h"
 #include "double.h"
 
@@ skipping 610 matching lines @@
       delta_minus->Times10();
       delta_plus->AssignBignum(*delta_minus);
     } else {
       delta_minus->Times10();
       delta_plus->Times10();
     }
   }
 }
 
 } }  // namespace v8::internal