Update for libunwindstack shared_ptr MapInfos.

Bug: 120606663

Test: Unit tests pass.
Change-Id: I0319a7daf9aaa280ed5048a8407175aa5aae91a8
Merged-In: I0319a7daf9aaa280ed5048a8407175aa5aae91a8
(cherry picked from commit 389cca45120ebc3786fa38c82f553f10bd200385)
2 files changed