Move strings-storage.* to the profiler directory

src/strings-storage.h

-// Copyright 2015 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_STRINGS_STORAGE_H_
-#define V8_STRINGS_STORAGE_H_
-
-#include "src/allocation.h"
-#include "src/hashmap.h"
-
-namespace v8 {
-namespace internal {
-
-// Provides a storage of strings allocated in C++ heap, to hold them
-// forever, even if they disappear from JS heap or external storage.
-class StringsStorage {
- public:
-  explicit StringsStorage(Heap* heap);
-  ~StringsStorage();
-
-  const char* GetCopy(const char* src);
-  const char* GetFormatted(const char* format, ...);
-  const char* GetVFormatted(const char* format, va_list args);
-  const char* GetName(Name* name);
-  const char* GetName(int index);
-  const char* GetFunctionName(Name* name);
-  const char* GetFunctionName(const char* name);
-  size_t GetUsedMemorySize() const;
-
- private:
-  static const int kMaxNameSize = 1024;
-
-  static bool StringsMatch(void* key1, void* key2);
-  const char* AddOrDisposeString(char* str, int len);
-  HashMap::Entry* GetEntry(const char* str, int len);
-
-  uint32_t hash_seed_;
-  HashMap names_;
-
-  DISALLOW_COPY_AND_ASSIGN(StringsStorage);
-};
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_STRINGS_STORAGE_H_