ok, exit() child processes instead of _exit()

We want the atexit() hook to print deferred logs (crash dumps, etc.) only when the main, parent process exits.  Ending the child processes with _exit() instead of exit() avoids calling atexit() hooks, but also global destructors.  This is more complex than we need: we can just print before main() exits.  Only the main, parent process gets there.

This now runs each child process' global destructors, which makes trace.json "work": we get a trace of whichever child process finishes last.  It's a start.

Change-Id: I0cc2b12592f0f79e73a43a160b9fd06dba1fee25
Reviewed-on: https://skia-review.googlesource.com/26800
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>

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