Clear next map word when folding allocations into js arrays.

src/hydrogen.cc

 // Copyright 2013 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 8289 matching lines @@
 void HOptimizedGraphBuilder::BuildEmitDeepCopy(
     Handle<JSObject> boilerplate_object,
     Handle<JSObject> original_boilerplate_object,
     Handle<Object> allocation_site_object,
     HInstruction* target,
     int* offset,
     HInstruction* data_target,
     int* data_offset,
     AllocationSiteMode mode) {
   bool create_allocation_site_info = mode == TRACK_ALLOCATION_SITE &&
-      boilerplate_object->map()->CanTrackAllocationSite();
+      AllocationSite::CanTrack(boilerplate_object->map()->instance_type());
 
   // If using allocation sites, then the payload on the site should already
   // be filled in as a valid (boilerplate) array.
   ASSERT(!create_allocation_site_info ||
          AllocationSite::cast(*allocation_site_object)->IsLiteralSite());
 
   HInstruction* allocation_site = NULL;
 
   if (create_allocation_site_info) {
     allocation_site = Add<HConstant>(allocation_site_object);
@@ skipping 35 matching lines @@
   // Copy in-object properties.
   if (boilerplate_object->map()->NumberOfFields() != 0) {
     HValue* object_properties =
         Add<HInnerAllocatedObject>(target, object_offset);
     BuildEmitInObjectProperties(boilerplate_object, original_boilerplate_object,
         object_properties, target, offset, data_target, data_offset);
   }
 
   // Create allocation site info.
   if (mode == TRACK_ALLOCATION_SITE &&
-      boilerplate_object->map()->CanTrackAllocationSite()) {
+      AllocationSite::CanTrack(boilerplate_object->map()->instance_type())) {
     elements_offset += AllocationMemento::kSize;
     *offset += AllocationMemento::kSize;
     BuildCreateAllocationMemento(target, JSArray::kSize, allocation_site);
   }
 }
 
 
 HValue* HOptimizedGraphBuilder::BuildEmitObjectHeader(
     Handle<JSObject> boilerplate_object,
     HInstruction* target,
@@ skipping 1486 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal