Move platform abstraction to base library

src/bignum-dtoa.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>
 
 #include "include/v8stdint.h"
-#include "src/checks.h"
+#include "src/base/logging.h"
 #include "src/utils.h"
 
 #include "src/bignum-dtoa.h"
 
 #include "src/bignum.h"
 #include "src/double.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 608 matching lines @@
       delta_minus->Times10();
       delta_plus->AssignBignum(*delta_minus);
     } else {
       delta_minus->Times10();
       delta_plus->Times10();
     }
   }
 }
 
 } }  // namespace v8::internal