Move platform abstraction to base library

src/fast-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 "include/v8stdint.h"
-#include "src/checks.h"
+#include "src/base/logging.h"
 #include "src/utils.h"
 
 #include "src/fast-dtoa.h"
 
 #include "src/cached-powers.h"
 #include "src/diy-fp.h"
 #include "src/double.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 689 matching lines @@
       UNREACHABLE();
   }
   if (result) {
     *decimal_point = *length + decimal_exponent;
     buffer[*length] = '\0';
   }
   return result;
 }
 
 } }  // namespace v8::internal