Elide hole checks on KeyedLoads of holey double arrays.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5472 matching lines @@
     return Representation::None();
   }
 
   virtual Representation observed_input_representation(int index) {
     return RequiredInputRepresentation(index);
   }
 
   virtual void PrintDataTo(StringStream* stream);
 
   bool UsesMustHandleHole() const;
+  bool AllUsesCanTreatHoleAsNaN() const;
   bool RequiresHoleCheck() const;
 
   virtual Range* InferRange(Zone* zone);
 
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyed)
 
  protected:
   virtual bool DataEquals(HValue* other) {
     if (!other->IsLoadKeyed()) return false;
     HLoadKeyed* other_load = HLoadKeyed::cast(other);
@@ skipping 1056 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_