Use utility method.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61304 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicStore.cpp b/lib/Analysis/BasicStore.cpp
index 0c1d879..fe14a9e 100644
--- a/lib/Analysis/BasicStore.cpp
+++ b/lib/Analysis/BasicStore.cpp
@@ -282,7 +282,7 @@
         return UnknownVal();
       
       Store store = state->getStore();
-      VarBindingsTy B(static_cast<const VarBindingsTy::TreeTy*>(store));
+      VarBindingsTy B = GetVarBindings(store);
       VarBindingsTy::data_type* T = B.lookup(R->getDecl());      
       return T ? *T : UnknownVal();
     }