libdebuggerd: clone registers before we Unwind with them.

Bug: http://b/77296294
Test: manual inspection of tombstone generated by crasher
Change-Id: I4b017701d7d2041db4aefbbb90977e99b844c328
(cherry picked from commit 5d1c14f41bac357c730aa47d705c1f1da7625280)
1 file changed