debuggerd: monitor the worker process for failure.
Use sigtimedwait on SIGCHLD to watch our forked worker processes for failure, so that we can guarantee that we always resume/kill the target process if libunwind crashes. Bug: http://b/27427439 Change-Id: I5a5da1f1abd7dc9d01223f5b3778e946e2d47d20 (cherry picked from commit 630bc80e)
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