Property reconfiguring implemented. Tests added.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 357d7b8b3b42750014844a4929678273105fa9ae..6116c6380b711079cdca4ae5227fdd6406641f3f 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -442,6 +442,24 @@ void Map::MapPrint(std::ostream& os) {  // NOLINT
 }
 
 
+// TODO(ishell): Move prototype transitions to separate class.
+void Map::PrintPrototypeTransitions(std::ostream& os) {  // NOLINT
+  FixedArray* cache = GetPrototypeTransitions();
+  int number_of_transitions = NumberOfProtoTransitions();
+  os << "Prototype transition array " << number_of_transitions << "\n";
+  const int proto_offset =
+      kProtoTransitionHeaderSize + kProtoTransitionPrototypeOffset;
+  const int map_offset = kProtoTransitionHeaderSize + kProtoTransitionMapOffset;
+  const int step = kProtoTransitionElementsPerEntry;
+  for (int i = 0; i < number_of_transitions; i++) {
+    Object* prototype = cache->get(proto_offset + i * step);
+    Object* map = cache->get(map_offset + i * step);
+    os << "   " << Brief(prototype) << " -> " << Brief(map) << "\n";
+  }
+  os << "\n";
+}
+
+
 void CodeCache::CodeCachePrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "CodeCache");
   os << "\n - default_cache: " << Brief(default_cache());