Add a FIXME to an assert.
Change a dyn_cast_or_null back to cast (which is more efficient).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@43152 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/SemaDecl.cpp b/Sema/SemaDecl.cpp
index 9c8ec7f..ee3cc7a 100644
--- a/Sema/SemaDecl.cpp
+++ b/Sema/SemaDecl.cpp
@@ -154,7 +154,7 @@
   IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list");
   ScopedDecl *VaDecl = LookupScopedDecl(VaIdent, Decl::IDNS_Ordinary, 
                                           SourceLocation(), TUScope);
-  TypedefDecl *VaTypedef = dyn_cast_or_null<TypedefDecl>(VaDecl);
+  TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl);
   Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef));
 }