Don't wrap roots in Handle just to dereference immediately.

src/profiler/heap-snapshot-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/profiler/heap-snapshot-generator.h"
 
 #include "src/code-stubs.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/objects-body-descriptors.h"
@@ skipping 1294 matching lines @@
   SetInternalReference(map, entry, "weak_cell_cache", map->weak_cell_cache(),
                        Map::kWeakCellCacheOffset);
 }
 
 
 void V8HeapExplorer::ExtractSharedFunctionInfoReferences(
     int entry, SharedFunctionInfo* shared) {
   HeapObject* obj = shared;
   String* shared_name = shared->DebugName();
   const char* name = NULL;
-  if (shared_name != *heap_->isolate()->factory()->empty_string()) {
+  if (shared_name != heap_->empty_string()) {
     name = names_->GetName(shared_name);
     TagObject(shared->code(), names_->GetFormatted("(code for %s)", name));
   } else {
     TagObject(shared->code(), names_->GetFormatted("(%s code)",
         Code::Kind2String(shared->code()->kind())));
   }
 
   SetInternalReference(obj, entry,
                        "name", shared->name(),
                        SharedFunctionInfo::kNameOffset);
@@ skipping 1788 matching lines @@
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8