There was at least one failure due to si_code being unitialized
and then examined.
Test: Run the 32 bit and 64 bit version of the unit tests on angler.
Change-Id: I5455a2cd29afafcd26a49f696e61141bb48478dc
Remove debuggerd in favor of a helper process that gets execed by
crashing processes.
Bug: http://b/30705528
Test: debuggerd_test
Change-Id: I9906c69473989cbf7fe5ea6cccf9a9c563d75906