Fix streamer desynchornization caused by streamer debugging patch

[Jan Hubicka]

Hi,
it turns out I lost one hunk in the patch disabling extra streaming
which causes streamer to go out of sync in the case non-trivial scc
containing the node being streamed appears in local stream (which seems
quite rare since it does not happen during bootstrap).

I am regtesting on x86_64-linux the following and will commit afterwards.

Honza

gcc/ChangeLog:

2020-05-29  Jan Hubicka  <hubi...@ucw.cz>

        PR lto/95362
        * lto-streamer-out.c (lto_output_tree):

diff --git a/gcc/lto-streamer-out.c b/gcc/lto-streamer-out.c
index 288e3c0f4c6..dfd32ece4bd 100644
--- a/gcc/lto-streamer-out.c
+++ b/gcc/lto-streamer-out.c
@@ -1791,8 +1791,9 @@ lto_output_tree (struct output_block *ob, tree expr,
            }
          streamer_write_record_start (ob, LTO_tree_pickle_reference);
          streamer_write_uhwi (ob, ix);
-         streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS,
-                              lto_tree_code_to_tag (TREE_CODE (expr)));
+         if (streamer_debugging)
+           streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS,
+                                lto_tree_code_to_tag (TREE_CODE (expr)));
        }
       in_dfs_walk = false;
       lto_stats.num_pickle_refs_output++;