[PATCH] pass_manager: Fix ICE with -fdump-passes -fdisable-tree-* [PR93874]

[Jan Hubicka]

> Hi!
> 
> dump_passes pushes a dummy function for which it evaluates the gates
> and checks whether the pass is enabled or disabled.
> Unfortunately, if any -fdisable-*-*/-fenable-*-* options were seen,
> we ICE during is_pass_explicitly_enabled_or_disabled because slot
> is non-NULL then and the code will do:
>   cgraph_uid = func ? cgraph_node::get (func)->get_uid () : 0;
> but the dummy function doesn't have a cgraph node.
> 
> So, either we need to create and then remove a cgraph node for the dummy
> function like the following patch, or function.c would need to export the
> in_dummy_function flag (or have some way to query that flag from other TUs)
> and we'd need to check it in is_pass_explicitly_enabled_or_disabled.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
> 
> 2020-02-25  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR middle-end/93874
> 	* passes.c (pass_manager::dump_passes): Create a cgraph node for the
> 	dummy function and remove it at the end.
> 
> 	* gcc.dg/pr93874.c: New test.

OK,
Honza