[ic] Use UnseededNumberDictionary as a storage for names in TypeFeedbackMetadata.

src/heap/heap.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_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 28 matching lines @@
   V(Oddball, the_hole_value, TheHoleValue)                                     \
   V(Oddball, null_value, NullValue)                                            \
   V(Oddball, true_value, TrueValue)                                            \
   V(Oddball, false_value, FalseValue)                                          \
   V(String, empty_string, empty_string)                                        \
   V(Map, meta_map, MetaMap)                                                    \
   V(Map, byte_array_map, ByteArrayMap)                                         \
   V(Map, fixed_array_map, FixedArrayMap)                                       \
   V(Map, fixed_cow_array_map, FixedCOWArrayMap)                                \
   V(Map, hash_table_map, HashTableMap)                                         \
+  V(Map, unseeded_number_dictionary_map, UnseededNumberDictionaryMap)          \

[Yang, 2016/06/28 17:10:31]

Please do NOT put the map randomly into the first 32 entries of the root list.
This list is carefully chosen. See comment above.

   V(Map, symbol_map, SymbolMap)                                                \
   V(Map, one_byte_string_map, OneByteStringMap)                                \
   V(Map, one_byte_internalized_string_map, OneByteInternalizedStringMap)       \
   V(Map, scope_info_map, ScopeInfoMap)                                         \
   V(Map, shared_function_info_map, SharedFunctionInfoMap)                      \
   V(Map, code_map, CodeMap)                                                    \
   V(Map, function_context_map, FunctionContextMap)                             \
   V(Map, cell_map, CellMap)                                                    \
   V(Map, weak_cell_map, WeakCellMap)                                           \
   V(Map, global_property_cell_map, GlobalPropertyCellMap)                      \
@@ skipping 2638 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_