Merge branch 'use-libc++abi' of https://github.com/awong-dev/ndk into use-libc++abi
Small cleanups. env-controlled tracing in test harness. Fixup ip from ret addr -> call for landingpad lookup.

Change-Id: I09247ffcce7dc21c150c01ffda7d73c254fdc66f
Merge branch 'use-libc++abi' of https://github.com/awong-dev/ndk into use-libc++abi
Merge pull request #48 from awong-dev/fix_ret_ip

Fix ret ip