New snapshot framework. Doesn't work on ARM yet (code targets...

src/bootstrapper.cc

Index: src/bootstrapper.cc
===================================================================
--- src/bootstrapper.cc	(revision 3115)
+++ src/bootstrapper.cc	(working copy)
@@ -316,8 +316,11 @@
 
 void Bootstrapper::Iterate(ObjectVisitor* v) {
   natives_cache.Iterate(v);
+  v->Synchronize("NativesCache");
   extensions_cache.Iterate(v);
+  v->Synchronize("Extensions");
   PendingFixups::Iterate(v);
+  v->Synchronize("PendingFixups");
 }