tree 160d2c2cca2c491e1b905793e6f0d6b90d78beef
parent 1db3789252342c5bfd34d889792866c3b4357b0c
author Elliott Hughes <enh@google.com> 1531332796 -0700
committer Elliott Hughes <enh@google.com> 1531342507 -0700

Move libbacktrace off cutils.

There's still <cutils/atomic.h> in a test, but I don't understand why
that isn't just std::atomic.

Also add a shared tgkill wrapper to libbase.

Bug: N/A
Test: ran tests
Change-Id: Idd4baa1e1670a84b3a8f35803cc5ffe5aae008a6