Fix bug in compilation-handlescope.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 946c1008aae1975ce143aaaee9c2cbb3c0f88b6e..e98e8433b60ea3f230751fefbb0683439ac5eee3 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -961,13 +961,15 @@ int Utf8Length(Handle<String> str) {
 
 DeferredHandleScope::DeferredHandleScope(Isolate* isolate)
     : impl_(isolate->handle_scope_implementer()) {
+  ASSERT(impl_->isolate() == Isolate::Current());
   impl_->BeginDeferredScope();
+  v8::ImplementationUtilities::HandleScopeData* data =
+      impl_->isolate()->handle_scope_data();
   Object** new_next = impl_->GetSpareOrNewBlock();
   Object** new_limit = &new_next[kHandleBlockSize];
+  ASSERT(data->limit == &impl_->blocks()->last()[kHandleBlockSize]);
   impl_->blocks()->Add(new_next);
 
-  v8::ImplementationUtilities::HandleScopeData* data =
-      impl_->isolate()->handle_scope_data();
 #ifdef DEBUG
   prev_level_ = data->level;
 #endif