Move platform abstraction to base library

src/hashmap.h

 // Copyright 2012 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.
 
 #ifndef V8_HASHMAP_H_
 #define V8_HASHMAP_H_
 
 #include "src/allocation.h"
-#include "src/checks.h"
+#include "src/base/logging.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 template<class AllocationPolicy>
 class TemplateHashMapImpl {
  public:
   typedef bool (*MatchFun) (void* key1, void* key2);
 
@@ skipping 317 matching lines @@
   Iterator end() const { return Iterator(this, NULL); }
   Iterator find(Key* key, bool insert = false,
                 AllocationPolicy allocator = AllocationPolicy()) {
     return Iterator(this, this->Lookup(key, key->Hash(), insert, allocator));
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HASHMAP_H_