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

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index e7dc81a803135d676f74172eafa5476fa1811b7f..a4e9ed72b1505026de7592a09d9cbe493f848598 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -53,6 +53,7 @@ class LChunkBuilder;
 
 
 #define HYDROGEN_ABSTRACT_INSTRUCTION_LIST(V)  \
+  V(BinaryOperation)                           \
   V(BitwiseBinaryOperation)                    \
   V(ControlInstruction)                        \
   V(Instruction)                               \
@@ -2677,6 +2678,8 @@ class HBinaryOperation: public HTemplateInstruction<3> {
   virtual bool IsCommutative() const { return false; }
 
   virtual void PrintDataTo(StringStream* stream);
+
+  DECLARE_ABSTRACT_INSTRUCTION(BinaryOperation)
 };