Add a 10 minute timeout to individual tests.

On the bots, we have a timeout without output of 60 minutes for the entire test.
This should ensure that we are able to kill mis-behaving tests and give a good
error instead of just getting a jenkins timeout error.

For those confused, this is for the guard malloc/leaks test.

rdar://36874229

benchmark/scripts/perf_test_driver/perf_test_driver.py

@@ -57,6 +57,24 @@ class Result(object):
         print(fmt.format(self.get_name(), self.get_result()))
 
 
+def run_with_timeout(func, args):
+    # We timeout after 10 minutes.
+    timeout_seconds = 10 * 60
+
+    # We just use this to create a timeout since we use an older python. Once
+    # we update to use python >= 3.3, use the timeout API on communicate
+    # instead.
+    import multiprocessing.dummy
+    fakeThreadPool = multiprocessing.dummy.Pool(1)
+    try:
+        result = fakeThreadPool.apply_async(func, args=args)
+        return result.get(timeout_seconds)
+    except multiprocessing.TimeoutError:
+        fakeThreadPool.terminate()
+        raise RuntimeError("Child process aborted due to timeout. "
+                           "Timeout: %s seconds" % timeout_seconds)
+
+
 def _unwrap_self(args):
     return type(args[0]).process_input(*args)