Move platform abstraction to base library

src/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/dtoa.h"
 
 #include "src/bignum-dtoa.h"
 #include "src/double.h"
 #include "src/fast-dtoa.h"
 #include "src/fixed-dtoa.h"
 
 namespace v8 {
@@ skipping 55 matching lines @@
   }
   if (fast_worked) return;
 
   // If the fast dtoa didn't succeed use the slower bignum version.
   BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode);
   BignumDtoa(v, bignum_mode, requested_digits, buffer, length, point);
   buffer[*length] = '\0';
 }
 
 } }  // namespace v8::internal