Log when the native trace is unavailable

This should allow us to differentiate between "couldn't get the
stack" and "didn't try to get the stack".  Also show the thread's
state (e.g. 'R' for running, 'D' for uninterruptible syscall).

Bug 7053953

(cherry-pick of b3667a19f5c573b7785876979af4781292d27327.)

Change-Id: I0a40cb3d3cdd9aef8589a39586cccd9c229aa8cb
4 files changed