Update for libunwindstack shared_ptr MapInfos.

Bug: 120606663

Test: Unit tests pass.
Change-Id: Ieae157388e8571345ed8968a2b5c2aa34464689f
Merged-In: Ieae157388e8571345ed8968a2b5c2aa34464689f
(cherry picked from commit 853733b627dc5bbb07b2463a1f10f10ddee06bbc)
3 files changed