Merge "Fix memory leak." am: 9455a028b1 am: 50fdaccd5d am: a75a350b21

Original change: https://android-review.googlesource.com/c/platform/system/unwinding/+/1937959

Change-Id: I61efedbe9fe83d0e56ffaff63dd3aa8763af5244
tree: 5934e20fae86cb21f408afad20544a33bd621bc8
  1. libbacktrace/
  2. libunwindstack/
  3. OWNERS
  4. PREUPLOAD.cfg