fix comment

From-SVN: r218400

gcc/cp/cp-tree.h

@@ -54,7 +54,6 @@ c-common.h, not after.
       NEW_EXPR_USE_GLOBAL (in NEW_EXPR).
       DELETE_EXPR_USE_GLOBAL (in DELETE_EXPR).
       COMPOUND_EXPR_OVERLOADED (in COMPOUND_EXPR).
-      TREE_INDIRECT_USING (in NAMESPACE_DECL).
       CLEANUP_P (in TRY_BLOCK)
       AGGR_INIT_VIA_CTOR_P (in AGGR_INIT_EXPR)
       PTRMEM_OK_P (in ADDR_EXPR, OFFSET_REF, SCOPE_REF)
@@ -70,6 +69,7 @@ c-common.h, not after.
       BASELINK_QUALIFIED_P (in BASELINK)
       TARGET_EXPR_IMPLICIT_P (in TARGET_EXPR)
       TEMPLATE_PARM_PARAMETER_PACK (in TEMPLATE_PARM_INDEX)
+      TREE_INDIRECT_USING (in a TREE_LIST of using-directives)
       ATTR_IS_DEPENDENT (in the TREE_LIST for an attribute)
       ABI_TAG_IMPLICIT (in the TREE_LIST for the argument of abi_tag)
       CONSTRUCTOR_IS_DIRECT_INIT (in CONSTRUCTOR)