Use the same registers for StoreIC and KeyedStoreIC.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index c0ab7e9e5a17cdb243db3224d5636aef572e8880..f6ae893b398d8433015e321584e03976f3898055 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -2455,6 +2455,23 @@ class ElementsTransitionAndStoreStub : public HydrogenCodeStub {
   virtual void InitializeInterfaceDescriptor(
       CodeStubInterfaceDescriptor* descriptor) V8_OVERRIDE;
 
+  enum RegisterInfo {
+    kValueIndex,
+    kMapIndex,
+    kKeyIndex,
+    kObjectIndex,
+    kRegisterArgumentCount
+  };
+
+  static const Register ValueRegister() {
+    return KeyedStoreIC::ValueRegister();
+  }
+  static const Register MapRegister() { return KeyedStoreIC::MapRegister(); }
+  static const Register KeyRegister() { return KeyedStoreIC::NameRegister(); }
+  static const Register ObjectRegister() {
+    return KeyedStoreIC::ReceiverRegister();
+  }
+
  private:
   class FromBits:      public BitField<ElementsKind,          0, 8> {};
   class ToBits:        public BitField<ElementsKind,          8, 8> {};