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

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 7f03d89abe43d005b325ea7a09122979e3794ed0..1badd964393b60b3cd41bd0b71247e6edcb109a4 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -46,6 +46,7 @@ using v8::MemoryPressureLevel;
   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)       \