Use the same registers for StoreIC and KeyedStoreIC.

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 79eccefab8b62f1cbfe4275f560713a95988f686..b7060516f4ca55e9b5f12ee5e925b037c57d343a 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -645,6 +645,17 @@ void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
 }
 
 
+void ElementsTransitionAndStoreStub::InitializeInterfaceDescriptor(
+    CodeStubInterfaceDescriptor* descriptor) {
+  Register registers[] = { ValueRegister(),
+                           MapRegister(),
+                           KeyRegister(),
+                           ObjectRegister() };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss));
+}
+
+
 void StoreGlobalStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
   Register registers[] = { StoreIC::ReceiverRegister(),