Improve memory usage of receiver type feedback.

src/hydrogen-instructions.cc

 // 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 1288 matching lines @@
 
 
 void HLoadNamedField::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
   stream->Add(" @%d%s", offset(), is_in_object() ? "[in-object]" : "");
 }
 
 
 HLoadNamedFieldPolymorphic::HLoadNamedFieldPolymorphic(HValue* context,
                                                        HValue* object,
-                                                       ZoneMapList* types,
+                                                       SmallMapList* types,
                                                        Handle<String> name)
     : types_(Min(types->length(), kMaxLoadPolymorphism)),
       name_(name),
       need_generic_(false) {
   SetOperandAt(0, context);
   SetOperandAt(1, object);
   set_representation(Representation::Tagged());
   SetFlag(kDependsOnMaps);
   for (int i = 0;
        i < types->length() && types_.length() < kMaxLoadPolymorphism;
@@ skipping 532 matching lines @@
 
 
 void HCheckPrototypeMaps::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal