Store HValue uses in a custom small list structure.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 513d4a8501b9210ab23ae2edd4b377cc1fcb8188..2ddf0e713b0ee79bfd3db74795c96fc04e8be95c 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -743,7 +743,7 @@ void HGraph::EliminateRedundantPhis() {
     if (value != NULL) {
       // Iterate through uses finding the ones that should be
       // replaced.
-      ZoneList<HValue*>* uses = phi->uses();
+      SmallPointerList<HValue>* uses = phi->uses();
       while (!uses->is_empty()) {
         HValue* use = uses->RemoveLast();
         if (use != NULL) {