Count closures using the feedback vector cell map, specialize if count==1.

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 75 matching lines @@
   /* Maps */                                                                   \
   V(Map, fixed_double_array_map, FixedDoubleArrayMap)                          \
   V(Map, mutable_heap_number_map, MutableHeapNumberMap)                        \
   V(Map, ordered_hash_table_map, OrderedHashTableMap)                          \
   V(Map, unseeded_number_dictionary_map, UnseededNumberDictionaryMap)          \
   V(Map, sloppy_arguments_elements_map, SloppyArgumentsElementsMap)            \
   V(Map, message_object_map, JSMessageObjectMap)                               \
   V(Map, external_map, ExternalMap)                                            \
   V(Map, bytecode_array_map, BytecodeArrayMap)                                 \
   V(Map, module_info_map, ModuleInfoMap)                                       \
+  V(Map, no_closures_cell_map, NoClosuresCellMap)                              \
+  V(Map, one_closure_cell_map, OneClosureCellMap)                              \
+  V(Map, many_closures_cell_map, ManyClosuresCellMap)                          \
   /* String maps */                                                            \
   V(Map, native_source_string_map, NativeSourceStringMap)                      \
   V(Map, string_map, StringMap)                                                \
   V(Map, cons_one_byte_string_map, ConsOneByteStringMap)                       \
   V(Map, cons_string_map, ConsStringMap)                                       \
   V(Map, thin_one_byte_string_map, ThinOneByteStringMap)                       \
   V(Map, thin_string_map, ThinStringMap)                                       \
   V(Map, sliced_string_map, SlicedStringMap)                                   \
   V(Map, sliced_one_byte_string_map, SlicedOneByteStringMap)                   \
   V(Map, external_string_map, ExternalStringMap)                               \
@@ skipping 204 matching lines @@
   V(EvalContextMap)                     \
   V(ScriptContextMap)                   \
   V(UndefinedMap)                       \
   V(TheHoleMap)                         \
   V(NullMap)                            \
   V(BooleanMap)                         \
   V(UninitializedMap)                   \
   V(ArgumentsMarkerMap)                 \
   V(JSMessageObjectMap)                 \
   V(ForeignMap)                         \
+  V(NoClosuresCellMap)                  \
+  V(OneClosureCellMap)                  \
+  V(ManyClosuresCellMap)                \
   V(NanValue)                           \
   V(InfinityValue)                      \
   V(MinusZeroValue)                     \
   V(MinusInfinityValue)                 \
   V(EmptyWeakCell)                      \
   V(empty_string)                       \
   PRIVATE_SYMBOL_LIST(V)
 
 // Forward declarations.
 class AllocationObserver;
@@ skipping 2361 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_