Set elf_start_offset for invalid elf maps.

Add new unit tests to cover this case.

Bug: 133495043

Test: New unit tests pass.
Change-Id: I9ded5732c3c40197ebfddee3dcacc4aa07541ac0
5 files changed
tree: 483657ee7764bd24b3dbd2ea352df8f3eed81666
  1. libbacktrace/
  2. libunwindstack/