Dmitri Hrybenko f2436065db StdlibUnittest: run tests out of process ...

The test harness now can recover after test crashes, allowing:

- check for crashes themselves (without reporting them to the Python lit driver,
  which is about 10x slower -- even if CrashTracer is disabled);

- recover from unexpected test crashes and run the rest of the tests;

- this lays the groundwork for assertions that end the test execution, but
  allow the rest of the tests to run (rdar://17906801).

Note that we don't spawn a fresh process for every test.  We create a child
process and reuse it until it crashes.


Swift SVN r21090

2014-08-07 15:14:57 +00:00

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