Optimistically assume that elements IC only transition once.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index c1b95494de7214f3caa74121e0925c0bce11aec7..c86f316ef315b4949fa94a428aee2cb08e228e0c 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -451,7 +451,7 @@ class KeyedIC: public IC {
  private:
   void GetReceiverMapsForStub(Handle<Code> stub, MapHandleList* result);
 
-  Handle<Code> ComputeMonomorphicStub(Handle<JSObject> receiver,
+  Handle<Code> ComputeMonomorphicStub(Handle<Map> receiver_map,
                                       StubKind stub_kind,
                                       StrictModeFlag strict_mode,
                                       Handle<Code> default_stub);
@@ -467,6 +467,12 @@ class KeyedIC: public IC {
   static bool IsGrowStubKind(StubKind stub_kind) {
     return stub_kind >= STORE_AND_GROW_NO_TRANSITION;
   }
+
+  static StubKind GetNoTransitionStubKind(StubKind stub_kind) {
+    if (!IsTransitionStubKind(stub_kind)) return stub_kind;
+    if (IsGrowStubKind(stub_kind)) return STORE_AND_GROW_NO_TRANSITION;
+    return STORE_NO_TRANSITION;
+  }
 };