[PATCH] Fix accounting for num_threaded_edges

[Jeff Law]

tree-ssa-threadupdate.c keeps  running total of the number of edges it 
threads.  Those totals are useful debugging tools and are also examined 
by the testsuite.

While looking at the effects of using the FSM threader on 
ssa-dom-thread-2?.c I noticed the counters weren't being updated 
properly for FSM threads.

This patch fixes that minor goof.

Bootstrapped & regression tested on x86_64-linux-gnu.  Installed on the 
trunk.

Jeff
commit 05dc98161472ce2e3d5f68bfcfca907deac03140
Author: Jeff Law <l...@redhat.com>
Date:   Wed Oct 14 11:52:01 2015 -0600

    [PATCH] Fix accounting for num_threaded_edges
    
        * tree-ssa-threadupdate.c (thread_through_all_blocks): Bump
        num_threaded_edges for successful FSM threads too.

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a555d2b..7c64fa8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-10-14  Jeff Law  <l...@redhat.com>
+
+       * tree-ssa-threadupdate.c (thread_through_all_blocks): Bump
+       num_threaded_edges for successful FSM threads too.
+
 2015-10-14  Richard Biener  <rguent...@suse.de>
 
        * tree-vectorizer.h (vect_is_simple_use): Remove unused parameters.
diff --git a/gcc/tree-ssa-threadupdate.c b/gcc/tree-ssa-threadupdate.c
index e426c1d..5632a88 100644
--- a/gcc/tree-ssa-threadupdate.c
+++ b/gcc/tree-ssa-threadupdate.c
@@ -2672,6 +2672,7 @@ thread_through_all_blocks (bool may_peel_loop_headers)
          free_dominance_info (CDI_DOMINATORS);
          bitmap_set_bit (threaded_blocks, entry->src->index);
          retval = true;
+         thread_stats.num_threaded_edges++;
        }
 
       delete_jump_thread_path (path);