add #include to make more self-contained.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63624 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Parse/Parser.h b/include/clang/Parse/Parser.h
index e2cac8d..d7c957f 100644
--- a/include/clang/Parse/Parser.h
+++ b/include/clang/Parse/Parser.h
@@ -18,6 +18,7 @@
 #include "clang/Parse/Action.h"
 #include "clang/Parse/DeclSpec.h"
 #include <stack>
+#include <list>
 
 namespace clang {
   class AttributeList;