Add a fixme.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120172 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/SValuator.cpp b/lib/Checker/SValuator.cpp
index a3bdcd7..73bd867 100644
--- a/lib/Checker/SValuator.cpp
+++ b/lib/Checker/SValuator.cpp
@@ -53,6 +53,7 @@
                                               ValMgr.getContext().IntTy));
 }
 
+// FIXME: should rewrite according to the cast kind.
 SVal SValuator::EvalCast(SVal val, QualType castTy, QualType originalTy) {
   if (val.isUnknownOrUndef() || castTy == originalTy)
     return val;