Reland of Introduce instance type for transition arrays.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 8d77d3941b52c474ffe3be6d03e530db7dfaae7a..cd7b6cf060f7dd52cdc47084b7b5f633938df63d 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -412,6 +412,7 @@
   V(FIXED_DOUBLE_ARRAY_TYPE)                                    \
   V(SHARED_FUNCTION_INFO_TYPE)                                  \
   V(WEAK_CELL_TYPE)                                             \
+  V(TRANSITION_ARRAY_TYPE)                                      \
                                                                 \
   V(JS_MESSAGE_OBJECT_TYPE)                                     \
                                                                 \
@@ -703,6 +704,7 @@
   SHARED_FUNCTION_INFO_TYPE,
   CELL_TYPE,
   WEAK_CELL_TYPE,
+  TRANSITION_ARRAY_TYPE,
   PROPERTY_CELL_TYPE,
   PROTOTYPE_INFO_TYPE,
   SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION_TYPE,
@@ -791,14 +793,13 @@
   V(MAP_CODE_CACHE_SUB_TYPE)                  \
   V(SCOPE_INFO_SUB_TYPE)                      \
   V(STRING_TABLE_SUB_TYPE)                    \
-  V(DESCRIPTOR_ARRAY_SUB_TYPE)                \
-  V(TRANSITION_ARRAY_SUB_TYPE)
+  V(DESCRIPTOR_ARRAY_SUB_TYPE)
 
 enum FixedArraySubInstanceType {
 #define DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE(name) name,
   FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE)
 #undef DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE
-  LAST_FIXED_ARRAY_SUB_TYPE = TRANSITION_ARRAY_SUB_TYPE
+      LAST_FIXED_ARRAY_SUB_TYPE = DESCRIPTOR_ARRAY_SUB_TYPE
 };
 
 
@@ -866,6 +867,7 @@
 class TypeFeedbackInfo;
 class TypeFeedbackVector;
 class WeakCell;
+class TransitionArray;
 
 // We cannot just say "class HeapType;" if it is created from a template... =8-?
 template<class> class TypeImpl;