Eliminate redundant descriptor ElementTransitionAndStoreDescriptor.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 75e2a6b1981407654b628d7757795429e81374ce..9b4bcee967a96918092a3424c79281ffdb2e17e0 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -17,7 +17,6 @@ class PlatformInterfaceDescriptor;
   V(Load)                                     \
   V(Store)                                    \
   V(StoreTransition)                          \
-  V(ElementTransitionAndStore)                \
   V(VectorStoreICTrampoline)                  \
   V(VectorStoreIC)                            \
   V(Instanceof)                               \
@@ -269,14 +268,6 @@ class StoreTransitionDescriptor : public StoreDescriptor {
 };
 
 
-class ElementTransitionAndStoreDescriptor : public StoreDescriptor {
- public:
-  DECLARE_DESCRIPTOR(ElementTransitionAndStoreDescriptor, StoreDescriptor)
-
-  static const Register MapRegister();
-};
-
-
 class InstanceofDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(InstanceofDescriptor, CallInterfaceDescriptor)