Add support for the new unwind method.

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

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: I252b9c2497e2d3d94347dd6e506170bf50cbfe16
8 files changed