C2 computes wrong trip count for loops

The trip count computed by IdealLoopTree::compute_profile_trip_cnt() is wrong. Both of the following loops have 9 iterations:

        for (int i = 1; i < 10; i++) {

        }

        int i = 1;
        do {

        } while (++i < 10);

But the trip count of the first one is computed as ~10 (9,9..):

Loop: N0/N0 has_sfpt
  Loop: N180/N179 limit_check
    Loop: N181/N91 limit_check counted [1,10),+1 (-1 iters) has_sfpt strip_mined
  Loop: N191/N190 limit_check
    Loop: N192/N164 limit_check counted [2,10),+1 (-1 iters) has_sfpt strip_mined
compute_profile_trip_cnt lp: 181 cnt: 9,986592

compute_profile_trip_cnt lp: 192 cnt: 9,000001