Make sure that the context argument of HAdd is never NULL.

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 35 matching lines @@
 class HBasicBlock;
 class HEnvironment;
 class HInstruction;
 class HLoopInformation;
 class HValue;
 class LInstruction;
 class LChunkBuilder;
 
 
 #define HYDROGEN_ABSTRACT_INSTRUCTION_LIST(V)  \
+  V(BinaryOperation)                           \
   V(BitwiseBinaryOperation)                    \
   V(ControlInstruction)                        \
   V(Instruction)                               \
 
 
 #define HYDROGEN_CONCRETE_INSTRUCTION_LIST(V)  \
   V(AbnormalExit)                              \
   V(AccessArgumentsAt)                         \
   V(Add)                                       \
   V(AllocateObject)                            \
@@ skipping 2604 matching lines @@
   }
 
   HValue* MostConstantOperand() {
     if (IsCommutative() && left()->IsConstant()) return left();
     return right();
   }
 
   virtual bool IsCommutative() const { return false; }
 
   virtual void PrintDataTo(StringStream* stream);
+
+  DECLARE_ABSTRACT_INSTRUCTION(BinaryOperation)
 };
 
 
 class HWrapReceiver: public HTemplateInstruction<2> {
  public:
   HWrapReceiver(HValue* receiver, HValue* function) {
     set_representation(Representation::Tagged());
     SetOperandAt(0, receiver);
     SetOperandAt(1, function);
   }
@@ skipping 2588 matching lines @@
   DECLARE_CONCRETE_INSTRUCTION(LoadFieldByIndex);
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_