Remove unnecessary overflow check in BuildCreateAllocationMemento.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 900e07ecdf9fa68a32540fc76be401d0b064a343..ef00703da7551eb0d76c61da21d6759dca4156e0 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -2592,6 +2592,8 @@ void HGraphBuilder::BuildCreateAllocationMemento(
             AllocationSite::kMementoCreateCountOffset));
     memento_create_count = AddUncasted<HAdd>(
         memento_create_count, graph()->GetConstant1());
+    // This smi value is reset to zero after every gc, overflow isn't a problem.

[Hannes Payer (out of office), 2013/12/04 10:32:33]

"isn't a problem since the counter is bounded by the new space size."

+    memento_create_count->ClearFlag(HValue::kCanOverflow);
     HStoreNamedField* store = Add<HStoreNamedField>(
         allocation_site, HObjectAccess::ForAllocationSiteOffset(
             AllocationSite::kMementoCreateCountOffset), memento_create_count);