Add support for the new unwind method.

Also add a comment to the GetElf function to indicate that it never returns
nullptr.

Also needed to add this library to the a million and one places that the vndk
has hard-coded this data.

Bug: 23762183

Test: Built, nothing uses the new code.
Test: However, I did run backtrace_test using this code, and all tests pass.
Change-Id: Ib270665dcb7a7607075e36d88be76dbde6e2faa8
(cherry picked from commit dc4104b7)