Use the same registers for StoreIC and KeyedStoreIC.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 486917fb425052a950bda0e5bfebbe2b43011ef9..48668d38ec400552180705ec3cb75568afe8c1c4 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -222,14 +222,6 @@ void ToBooleanStub::InitializeInterfaceDescriptor(
 }
 
 
-void ElementsTransitionAndStoreStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  Register registers[] = { rax, rbx, rcx, rdx };
-  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-                         FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss));
-}
-
-
 void BinaryOpICStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
   Register registers[] = { rdx, rax };