[NOT FOR LANDING] Patch for experiments: V8

src/global-handles.cc

Index: src/global-handles.cc
diff --git a/src/global-handles.cc b/src/global-handles.cc
index ff7f132305cd73a4098608a432a10d13612a83e2..ee69283218dae333894bde8a61d4cdf6e417c510 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -499,6 +499,7 @@ class GlobalHandles::NodeIterator {
 
   void Advance() {
     DCHECK(!done());
+    __builtin_prefetch(block_->next_used());
     if (++index_ < NodeBlock::kSize) return;
     index_ = 0;
     block_ = block_->next_used();