Defer creating Handles for HConstants to the code generation phase.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index ac19db71fb6e7fb0f3b55edfbe93a9bffad8cabf..24d350d337ddb481d60f24a7fc57182eae105fb7 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -348,6 +348,8 @@ class HGraph: public ZoneObject {
  private:
   HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
                          Handle<Object> value);
+  HConstant* GetConstantInt32(SetOncePointer<HConstant>* pointer,
+                              int32_t integer_value);
 
   void MarkAsDeoptimizingRecursively(HBasicBlock* block);
   void InsertTypeConversions(HInstruction* instr);