Add a tentative assertion.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58492 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/GRExprEngine.cpp b/lib/Analysis/GRExprEngine.cpp
index cf8c25a..21fe3da 100644
--- a/lib/Analysis/GRExprEngine.cpp
+++ b/lib/Analysis/GRExprEngine.cpp
@@ -861,10 +861,11 @@
     return;
 
   } else if (const FunctionDecl* FD = dyn_cast<FunctionDecl>(D)) {
-    // We return the loc::FuncVal for an FunctionDecl in both rvalue
-    // and lvalue contexts.
     // FIXME: Does this need to be revised?  We were getting cases in
     //  real code that did this.
+
+    assert(asLValue); // Can we assume this?
+
     SVal V = loc::FuncVal(FD);
     MakeNode(Dst, Ex, Pred, BindExpr(St, Ex, V));
     return;