[pph] Stream DECL_CHAIN only for VAR/FUNCTION_DECLs that are part of a RECORD_OR_UNION_TYPE

gcc/cp/pph-streamer-in.c

Index: gcc/cp/pph-streamer-in.c
diff --git a/gcc/cp/pph-streamer-in.c b/gcc/cp/pph-streamer-in.c
index 0bab93b..d78ee91 100644
--- a/gcc/cp/pph-streamer-in.c
+++ b/gcc/cp/pph-streamer-in.c
@@ -1396,7 +1396,8 @@ pph_in_function_decl (pph_stream *stream, tree fndecl)
   pph_in_lang_specific (stream, fndecl);
   DECL_SAVED_TREE (fndecl) = pph_in_tree (stream);
   DECL_STRUCT_FUNCTION (fndecl) = pph_in_struct_function (stream, fndecl);
-  DECL_CHAIN (fndecl) = pph_in_tree (stream);
+  if (DECL_CONTEXT (fndecl) && RECORD_OR_UNION_TYPE_P (DECL_CONTEXT (fndecl)))
+    DECL_CHAIN (fndecl) = pph_in_tree (stream);
   if (DECL_SAVED_TREE (fndecl))
     VEC_safe_push (tree, gc, stream->fns_to_expand, fndecl);
 }
@@ -1436,7 +1437,9 @@ pph_read_tree (struct lto_input_block *ib ATTRIBUTE_UNUSED,
       DECL_INITIAL (expr) = pph_in_tree (stream);
       pph_in_lang_specific (stream, expr);
       /* DECL_CHAIN is handled by generic code, except for VAR_DECLs.  */
-      if (TREE_CODE (expr) == VAR_DECL)
+      if (TREE_CODE (expr) == VAR_DECL
+	  && DECL_CONTEXT (expr)
+	  && RECORD_OR_UNION_TYPE_P (DECL_CONTEXT (expr)))
 	DECL_CHAIN (expr) = pph_in_tree (stream);
       break;