Replace HCheckPrototypeMaps by explicit map checks of constant values.

src/hydrogen-instructions.cc

 // Copyright 2012 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 1721 matching lines @@
   return "";
 }
 
 
 void HCheckInstanceType::PrintDataTo(StringStream* stream) {
   stream->Add("%s ", GetCheckName());
   HUnaryOperation::PrintDataTo(stream);
 }
 
 
-void HCheckPrototypeMaps::PrintDataTo(StringStream* stream) {
-  stream->Add("[receiver_prototype=%p,holder=%p]%s",
-              *prototypes_.first(), *prototypes_.last(),
-              CanOmitPrototypeChecks() ? " (omitted)" : "");
-}
-
-
 void HCallStub::PrintDataTo(StringStream* stream) {
   stream->Add("%s ",
               CodeStub::MajorName(major_key_, false));
   HUnaryCall::PrintDataTo(stream);
 }
 
 
 void HInstanceOf::PrintDataTo(StringStream* stream) {
   left()->PrintNameTo(stream);
   stream->Add(" ");
@@ skipping 987 matching lines @@
     has_external_reference_value_(true),
     is_internalized_string_(false),
     is_not_in_new_space_(true),
     is_cell_(false),
     boolean_value_(true),
     external_reference_value_(reference) {
   Initialize(Representation::External());
 }
 
 
+static void PrepareConstant(Handle<Object> object) {
+  if (!object->IsJSObject()) return;
+  Handle<JSObject> js_object = Handle<JSObject>::cast(object);
+  if (!js_object->map()->is_deprecated()) return;
+  JSObject::TryMigrateInstance(js_object);
+}
+
+
 void HConstant::Initialize(Representation r) {
   if (r.IsNone()) {
     if (has_smi_value_ && kSmiValueSize == 31) {
       r = Representation::Smi();
     } else if (has_int32_value_) {
       r = Representation::Integer32();
     } else if (has_double_value_) {
       r = Representation::Double();
     } else if (has_external_reference_value_) {
       r = Representation::External();
     } else {
+      PrepareConstant(handle_);
       r = Representation::Tagged();
     }
   }
   set_representation(r);
   SetFlag(kUseGVN);
 }
 
 
 bool HConstant::EmitAtUses() {
   ASSERT(IsLinked());
@@ skipping 1692 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal