correctly invalidate global cells

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 8f3b04acfb028534b449de14d79a843e4afe3b93..87260e9e27815a5ef39062e8536296ca4d92a55c 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5416,7 +5416,8 @@ class HLoadGlobalCell FINAL : public HTemplateInstruction<0> {
                                  PropertyDetails);
 
   Unique<Cell> cell() const { return cell_; }
-  bool RequiresHoleCheck() const;
+  // TODO(dcarney): remove this.
+  bool RequiresHoleCheck() const { return false; }
 
   std::ostream& PrintDataTo(std::ostream& os) const OVERRIDE;  // NOLINT
 
@@ -5443,7 +5444,7 @@ class HLoadGlobalCell FINAL : public HTemplateInstruction<0> {
     SetDependsOnFlag(kGlobalVars);
   }
 
-  bool IsDeletable() const OVERRIDE { return !RequiresHoleCheck(); }
+  bool IsDeletable() const OVERRIDE { return true; }
 
   Unique<Cell> cell_;
   PropertyDetails details_;
@@ -5807,7 +5808,8 @@ class HStoreGlobalCell FINAL : public HUnaryOperation {
                                  Handle<PropertyCell>, PropertyDetails);
 
   Unique<PropertyCell> cell() const { return cell_; }
-  bool RequiresHoleCheck() { return details_.IsConfigurable(); }
+  // TODO(dcarney): remove
+  bool RequiresHoleCheck() const { return false; }
   bool NeedsWriteBarrier() {
     return StoringValueNeedsWriteBarrier(value());
   }