Small changes in preparation for Hydrogen-generated KeyedLoadGeneric

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4f83aafa72e0515cf4a419f1d1cc16f25ba29a81..29da29e60fd6802579e043c9f69810eae08ac04c 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -7776,6 +7776,8 @@ class HForInCacheArray V8_FINAL : public HTemplateInstruction<2> {
 
 class HLoadFieldByIndex V8_FINAL : public HTemplateInstruction<2> {
  public:
+  DECLARE_INSTRUCTION_FACTORY_P2(HLoadFieldByIndex, HValue*, HValue*);
+
   HLoadFieldByIndex(HValue* object,
                     HValue* index) {
     SetOperandAt(0, object);
@@ -7785,7 +7787,11 @@ class HLoadFieldByIndex V8_FINAL : public HTemplateInstruction<2> {
   }
 
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
-    return Representation::Tagged();
+    if (index == 1) {
+      return Representation::Smi();
+    } else {
+      return Representation::Tagged();
+    }
   }
 
   HValue* object() { return OperandAt(0); }