Add initial support for constant CFStrings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41136 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/SemaExpr.cpp b/Sema/SemaExpr.cpp
index 43e0686..64769c8 100644
--- a/Sema/SemaExpr.cpp
+++ b/Sema/SemaExpr.cpp
@@ -561,7 +561,8 @@
   if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn))
     if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()))
       if (FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()))
-        CheckFunctionCall(Fn, LParenLoc, RParenLoc, FDecl, Args, NumArgsInCall);
+        if (!CheckFunctionCall(Fn, LParenLoc, RParenLoc, FDecl, Args, NumArgsInCall))
+          return true;
 
   return new CallExpr(Fn, Args, NumArgsInCall, resultType, RParenLoc);
 }