Revert of Introduce instance type for transition arrays.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 26384576cc1a8bddaea8a352993e535ac0a342d5..f9435439666b9b641eff7e31aedcba416cac579d 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -61,7 +61,6 @@
   V(Map, fixed_cow_array_map, FixedCOWArrayMap)                                \
   V(Map, fixed_double_array_map, FixedDoubleArrayMap)                          \
   V(Map, weak_cell_map, WeakCellMap)                                           \
-  V(Map, transition_array_map, TransitionArrayMap)                             \
   V(Map, one_byte_string_map, OneByteStringMap)                                \
   V(Map, one_byte_internalized_string_map, OneByteInternalizedStringMap)       \
   V(Map, function_context_map, FunctionContextMap)                             \
@@ -424,7 +423,6 @@
   V(FixedCOWArrayMap)                   \
   V(FixedDoubleArrayMap)                \
   V(WeakCellMap)                        \
-  V(TransitionArrayMap)                 \
   V(NoInterceptorResultSentinel)        \
   V(HashTableMap)                       \
   V(OrderedHashTableMap)                \
@@ -884,13 +882,6 @@
   }
   Object* encountered_weak_cells() const { return encountered_weak_cells_; }
 
-  void set_encountered_transition_arrays(Object* transition_array) {
-    encountered_transition_arrays_ = transition_array;
-  }
-  Object* encountered_transition_arrays() const {
-    return encountered_transition_arrays_;
-  }
-
   // Number of mark-sweeps.
   int ms_count() const { return ms_count_; }
 
@@ -2104,8 +2095,6 @@
 
   MUST_USE_RESULT AllocationResult AllocateWeakCell(HeapObject* value);
 
-  MUST_USE_RESULT AllocationResult AllocateTransitionArray(int capacity);
-
   // Allocates a new utility object in the old generation.
   MUST_USE_RESULT AllocationResult AllocateStruct(InstanceType type);
 
@@ -2231,8 +2220,6 @@
   Object* encountered_weak_collections_;
 
   Object* encountered_weak_cells_;
-
-  Object* encountered_transition_arrays_;
 
   StoreBufferRebuilder store_buffer_rebuilder_;