Don't smi-untag on 64bit in the store-field stub

BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/451573002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22973 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/code-stubs-hydrogen.cc

@@ -630,7 +630,7 @@ void CodeStubGraphBuilderBase::BuildStoreNamedField(
     BuildCheckHeapObject(value);
   }
 
-  Add<HStoreNamedField>(object, access, value, STORE_TO_INITIALIZED_ENTRY);
+  Add<HStoreNamedField>(object, access, value, INITIALIZING_STORE);
 }