Replace math.h with cmath

src/cached-powers.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
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 //       with the distribution.
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 //       from this software without specific prior written permission.
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 #include <stdarg.h>
-#include <math.h>
 #include <limits.h>
+#include <cmath>
 
 #include "../include/v8stdint.h"
 #include "globals.h"
 #include "checks.h"
 #include "cached-powers.h"
 
 namespace v8 {
 namespace internal {
 
 struct CachedPower {
@@ skipping 129 matching lines @@
   int index =
       (requested_exponent + kCachedPowersOffset) / kDecimalExponentDistance;
   CachedPower cached_power = kCachedPowers[index];
   *power = DiyFp(cached_power.significand, cached_power.binary_exponent);
   *found_exponent = cached_power.decimal_exponent;
   ASSERT(*found_exponent <= requested_exponent);
   ASSERT(requested_exponent < *found_exponent + kDecimalExponentDistance);
 }
 
 } }  // namespace v8::internal