Update for libunwindstack changes. am: 4e633f9614 am: 1789e38bf3 am: 19013a76db am: 29dd3efdf4

Original change: https://android-review.googlesource.com/c/platform/external/gwp_asan/+/1437929

Change-Id: Iec050d3c1641873261a6e886ee2c5d9454c0153f