Rename references to "external pages" as "snapshot pages" to avoid confusion with the kind of exter…

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 1033 matching lines @@
   cls = isolate->class_table()->At(kFreeListElement);
   cls.set_name(Symbols::FreeListElement());
   cls = isolate->class_table()->At(kForwardingCorpse);
   cls.set_name(Symbols::ForwardingCorpse());
 
   {
     ASSERT(isolate == Dart::vm_isolate());
     WritableVMIsolateScope scope(Thread::Current());
     PremarkingVisitor premarker;
     ASSERT(isolate->heap()->UsedInWords(Heap::kNew) == 0);
-    isolate->heap()->IterateOldObjectsNoExternalPages(&premarker);
+    isolate->heap()->IterateOldObjectsNoImagePages(&premarker);
     // Make the VM isolate read-only again after setting all objects as marked.
+    // Note objects in image pages are already pre-marked.
   }
 }
 
 
 void Object::set_vm_isolate_snapshot_object_table(const Array& table) {
   ASSERT(Isolate::Current() == Dart::vm_isolate());
   *vm_isolate_snapshot_object_table_ = table.raw();
 }
 
 
@@ skipping 21951 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart