[Google] Fix the bug in calculating sum_all

[Dehao Chen]

Hi,

This patch fix the bug of sum_all, which is used in loop unroll. The
fix will suppress unrolling loops when the program is hot instruction
footprint is large.

Bootstrapped and passed regression tests.

Is it okay for googe-4_7 branch?

Thanks,
Dehao

--- a/gcc/auto-profile.c
+++ b/gcc/auto-profile.c
@@ -1172,8 +1172,7 @@ process_auto_profile (void)
        {
          (*func_slot)->entry_count += gcov_functions[i].entry_count;
          (*func_slot)->total_count += gcov_functions[i].total_count;
-         if ((*func_slot)->total_count > afdo_profile_info->sum_all)
-           afdo_profile_info->sum_all = (*func_slot)->total_count;
+         afdo_profile_info->sum_all += (*func_slot)->total_count;
        }
       else
        *func_slot = gcov_functions + i;
@@ -1275,6 +1274,7 @@ init_auto_profile (void)
     xcalloc (1, sizeof (struct gcov_ctr_summary));
   afdo_profile_info->runs = 1;
   afdo_profile_info->sum_max = 0;
+  afdo_profile_info->sum_all = 0;

   /* Read the profile from the profile file.  */
   read_profile ();