correctly invalidate global cells

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/bits.h"
 #include "src/double.h"
 #include "src/factory.h"
 #include "src/hydrogen-infer-representation.h"
@@ skipping 3614 matching lines @@
 
 
 std::ostream& HLoadGlobalCell::PrintDataTo(std::ostream& os) const {  // NOLINT
   os << "[" << *cell().handle() << "]";
   if (details_.IsConfigurable()) os << " (configurable)";
   if (details_.IsReadOnly()) os << " (read-only)";
   return os;
 }
 
 
-bool HLoadGlobalCell::RequiresHoleCheck() const {
-  if (!details_.IsConfigurable()) return false;
-  for (HUseIterator it(uses()); !it.Done(); it.Advance()) {
-    HValue* use = it.value();
-    if (!use->IsChange()) return true;
-  }
-  return false;
-}
-
-
 std::ostream& HLoadGlobalGeneric::PrintDataTo(
     std::ostream& os) const {  // NOLINT
   return os << name()->ToCString().get() << " ";
 }
 
 
 std::ostream& HInnerAllocatedObject::PrintDataTo(
     std::ostream& os) const {  // NOLINT
   os << NameOf(base_object()) << " offset ";
   return offset()->PrintTo(os);
@@ skipping 1148 matching lines @@
       break;
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 } }  // namespace v8::internal