[Bug ipa/65858] ICE in varpool_node::get_constructor during chromium build on arm-linux-gnueabihf with LTO during LINK chrome

["hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65858

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Those two bugs seems to be caused by same issue. Unforutnately it is bit hard
to guess what it is coming from - it seems that we manage to store
error_mark_node into the LTO object file.

If you can patch your GCC tree, the following (untested) patch should bring the
ICE from link time to compile time making it easier to reproduce (I build
chromium on x86_64 and did not see this crash)

Index: lto-streamer-out.c
===================================================================
--- lto-streamer-out.c  (revision 222160)
+++ lto-streamer-out.c  (working copy)
@@ -2149,6 +2149,7 @@
   /* Output DECL_INITIAL for the function, which contains the tree of
      lexical scopes.  */
   stream_write_tree (ob, DECL_INITIAL (var), true);
+  gcc_assert (DECL_INITIAL (var) != error_mark_node);

   /* Create a section to hold the pickled output of this function.   */
   produce_asm (ob, var);