Revert "Fix and cleanup Map::GeneralizeRepresentation()."

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 5afb690ee286115282df7ef94bac945e6dbb9c4e..5d96c2fbfc914be07b180f6def5ef916d9b39c3d 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3441,6 +3441,20 @@ class DescriptorArray: public FixedArray {
   // array.
   inline void Append(Descriptor* desc);
 
+  static Handle<DescriptorArray> Merge(Handle<Map> left_map,
+                                       int verbatim,
+                                       int valid,
+                                       int new_size,
+                                       int modify_index,
+                                       StoreMode store_mode,
+                                       Handle<Map> right_map)
+      V8_WARN_UNUSED_RESULT;
+
+  bool IsMoreGeneralThan(int verbatim,
+                         int valid,
+                         int new_size,
+                         DescriptorArray* other);
+
   static Handle<DescriptorArray> CopyUpTo(Handle<DescriptorArray> desc,
                                           int enumeration_index,
                                           int slack = 0);
@@ -6719,6 +6733,7 @@ class Map: public HeapObject {
   void DeprecateTransitionTree();
   void DeprecateTarget(Name* key, DescriptorArray* new_descriptors);
 
+  Map* FindUpdatedMap(int verbatim, int length, DescriptorArray* descriptors);
   Map* FindLastMatchMap(int verbatim, int length, DescriptorArray* descriptors);
 
   void UpdateDescriptor(int descriptor_number, Descriptor* desc);