ART: Fix incorrect last range when adding high interval

Adding a high interval clones live ranges but assigns last_range from
the low interval. This should not cause any problems as last_range
is only used for constant-time GetEnd which will return the same
value for both low/high intervals.

Change-Id: Iaf242183436c8ac2f78c0aeea22cd07cd4beacc0
1 file changed