Make accessors for oddball objects return Oddball* instead of Object*.

src/heap.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 34 matching lines @@
 namespace v8 {
 namespace internal {
 
 // TODO(isolates): remove HEAP here
 #define HEAP (_inline_get_heap_())
 class Heap;
 inline Heap* _inline_get_heap_();
 
 
 // Defines all the roots in Heap.
-#define STRONG_ROOT_LIST(V)                                      \
+#define STRONG_ROOT_LIST(V)                                                    \
   V(Map, byte_array_map, ByteArrayMap)                                         \
   V(Map, free_space_map, FreeSpaceMap)                                         \
   V(Map, one_pointer_filler_map, OnePointerFillerMap)                          \
   V(Map, two_pointer_filler_map, TwoPointerFillerMap)                          \
   /* Cluster the most popular ones in a few cache lines here at the top.    */ \
   V(Smi, store_buffer_top, StoreBufferTop)                                     \
-  V(Object, undefined_value, UndefinedValue)                                   \
-  V(Object, the_hole_value, TheHoleValue)                                      \
-  V(Object, null_value, NullValue)                                             \
-  V(Object, true_value, TrueValue)                                             \
-  V(Object, false_value, FalseValue)                                           \
-  V(Object, arguments_marker, ArgumentsMarker)                                 \
-  V(Object, frame_alignment_marker, FrameAlignmentMarker)                      \
+  V(Oddball, undefined_value, UndefinedValue)                                  \
+  V(Oddball, the_hole_value, TheHoleValue)                                     \
+  V(Oddball, null_value, NullValue)                                            \
+  V(Oddball, true_value, TrueValue)                                            \
+  V(Oddball, false_value, FalseValue)                                          \
+  V(Oddball, arguments_marker, ArgumentsMarker)                                \
+  V(Oddball, frame_alignment_marker, FrameAlignmentMarker)                     \
   V(Map, heap_number_map, HeapNumberMap)                                       \
   V(Map, global_context_map, GlobalContextMap)                                 \
   V(Map, fixed_array_map, FixedArrayMap)                                       \
   V(Map, serialized_scope_info_map, SerializedScopeInfoMap)                    \
   V(Map, fixed_cow_array_map, FixedCOWArrayMap)                                \
   V(Map, fixed_double_array_map, FixedDoubleArrayMap)                          \
   V(Object, no_interceptor_result_sentinel, NoInterceptorResultSentinel)       \
   V(Map, meta_map, MetaMap)                                                    \
   V(Map, hash_table_map, HashTableMap)                                         \
   V(Smi, stack_limit, StackLimit)                                              \
   V(FixedArray, number_string_cache, NumberStringCache)                        \
-  V(FixedArray, string_locks, StringLocks)                        \
+  V(FixedArray, string_locks, StringLocks)                                     \
   V(Object, instanceof_cache_function, InstanceofCacheFunction)                \
   V(Object, instanceof_cache_map, InstanceofCacheMap)                          \
   V(Object, instanceof_cache_answer, InstanceofCacheAnswer)                    \
   V(FixedArray, single_character_string_cache, SingleCharacterStringCache)     \
   V(FixedArray, string_split_cache, StringSplitCache)                          \
   V(Object, termination_exception, TerminationException)                       \
   V(FixedArray, empty_fixed_array, EmptyFixedArray)                            \
   V(ByteArray, empty_byte_array, EmptyByteArray)                               \
   V(FixedDoubleArray, empty_fixed_double_array, EmptyFixedDoubleArray)         \
   V(String, empty_string, EmptyString)                                         \
@@ skipping 29 matching lines @@
   V(Map, function_context_map, FunctionContextMap)                             \
   V(Map, catch_context_map, CatchContextMap)                                   \
   V(Map, with_context_map, WithContextMap)                                     \
   V(Map, block_context_map, BlockContextMap)                                   \
   V(Map, code_map, CodeMap)                                                    \
   V(Map, oddball_map, OddballMap)                                              \
   V(Map, global_property_cell_map, GlobalPropertyCellMap)                      \
   V(Map, shared_function_info_map, SharedFunctionInfoMap)                      \
   V(Map, message_object_map, JSMessageObjectMap)                               \
   V(Map, foreign_map, ForeignMap)                                              \
-  V(Object, nan_value, NanValue)                                               \
-  V(Object, infinity_value, InfinityValue)                                     \
-  V(Object, minus_zero_value, MinusZeroValue)                                  \
+  V(HeapNumber, nan_value, NanValue)                                           \
+  V(HeapNumber, infinity_value, InfinityValue)                                 \
+  V(HeapNumber, minus_zero_value, MinusZeroValue)                              \
   V(Map, neander_map, NeanderMap)                                              \
   V(JSObject, message_listeners, MessageListeners)                             \
   V(Foreign, prototype_accessors, PrototypeAccessors)                          \
   V(NumberDictionary, code_stubs, CodeStubs)                                   \
   V(NumberDictionary, non_monomorphic_cache, NonMonomorphicCache)              \
   V(PolymorphicCodeCache, polymorphic_code_cache, PolymorphicCodeCache)        \
   V(Code, js_entry_code, JsEntryCode)                                          \
   V(Code, js_construct_entry_code, JsConstructEntryCode)                       \
   V(FixedArray, natives_source_cache, NativesSourceCache)                      \
   V(Object, last_script_id, LastScriptId)                                      \
@@ skipping 2341 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_