[ping][PR target/85401] initialize the move cost table before using it

[coypu]

re-posting, now CC'ing vmakarov who might be the right person to ping
about issues in this file.  apologies for the noise if I'm wrong.

--
This seems to be the way the rest of ira-color.c does it.
I hope it's OK. It does fix the segfault.

2019-09-10      Maya Rashish <co...@sdf.org>

        PR target/85401
        * ira-color.c: (allocno_copy_cost_saving) Call
        ira_init_register_move_cost_if_necessary

diff --git a/gcc/ira-color.c b/gcc/ira-color.c
index 99236994d64..5d721102e19 100644
--- a/gcc/ira-color.c
+++ b/gcc/ira-color.c
@@ -2828,6 +2828,7 @@ allocno_copy_cost_saving (ira_allocno_t allocno, int 
hard_regno)
        }
       else
        gcc_unreachable ();
+      ira_init_register_move_cost_if_necessary(allocno_mode);
       cost += cp->freq * ira_register_move_cost[allocno_mode][rclass][rclass];
     }
   return cost;