Remove int.pow and double.pow from VM library.

runtime/lib/double.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <math.h>
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/code_generator.h"  // DartModulo.
@@ skipping 154 matching lines @@
   return Double::New(ceil(arg.value()));
 }
 
 
 DEFINE_NATIVE_ENTRY(Double_truncate, 1) {
   const Double& arg = Double::CheckedHandle(arguments->NativeArgAt(0));
   return Double::New(trunc(arg.value()));
 }
 
 
-DEFINE_NATIVE_ENTRY(Double_pow, 2) {
-  const double operand =
-      Double::CheckedHandle(arguments->NativeArgAt(0)).value();
-  GET_NON_NULL_NATIVE_ARGUMENT(
-      Double, exponent_object, arguments->NativeArgAt(1));
-  const double exponent = exponent_object.value();
-  return Double::New(pow(operand, exponent));
-}
-
-
 #if defined(TARGET_OS_MACOS)
 // MAC OSX math library produces old style cast warning.
 #pragma GCC diagnostic ignored "-Wold-style-cast"
 #endif
 
 DEFINE_NATIVE_ENTRY(Double_toInt, 1) {
   const Double& arg = Double::CheckedHandle(arguments->NativeArgAt(0));
   return DoubleToInteger(arg.value(), "Infinity or NaN toInt");
 }
 
@@ skipping 92 matching lines @@
 
 DEFINE_NATIVE_ENTRY(Double_getIsNegative, 1) {
   const Double& arg = Double::CheckedHandle(arguments->NativeArgAt(0));
   // Include negative zero, infinity.
   return Bool::Get(signbit(arg.value()) && !isnan(arg.value()));
 }
 
 // Add here only functions using/referring to old-style casts.
 
 }  // namespace dart