Merge changes up to V8 version 2.1.3 into the partial snapshots

src/ast.cc

Index: src/ast.cc
===================================================================
--- src/ast.cc	(revision 3964)
+++ src/ast.cc	(working copy)
@@ -67,8 +67,6 @@
     inside_with_(inside_with) {
   // names must be canonicalized for fast equality checks
   ASSERT(name->IsSymbol());
-  // at least one access, otherwise no need for a VariableProxy
-  var_uses_.RecordRead(1);
 }
 
 
@@ -87,8 +85,7 @@
   // eval() etc.  Const-ness and variable declarations are a complete mess
   // in JS. Sigh...
   var_ = var;
-  var->var_uses()->RecordUses(&var_uses_);
-  var->obj_uses()->RecordUses(&obj_uses_);
+  var->set_is_used(true);
 }