Implement tracking and optimizations of packed arrays.

src/jsregexp.cc

Index: src/jsregexp.cc
diff --git a/src/jsregexp.cc b/src/jsregexp.cc
index 1055ad3fc70189a4d8f2dfa395d6b90d222a1723..d308dba68b37531cb4ecd995eb13ef4b715e7b8e 100644
--- a/src/jsregexp.cc
+++ b/src/jsregexp.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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:
@@ -324,7 +324,7 @@ Handle<Object> RegExpImpl::AtomExec(Handle<JSRegExp> re,
                                index)));
     if (index == -1) return isolate->factory()->null_value();
   }
-  ASSERT(last_match_info->HasFastElements());
+  ASSERT(last_match_info->HasFastObjectElements());
 
   {
     NoHandleAllocation no_handles;