Split test_lib2to3 into small and large variants

and only run the small variant in debug mode to avoid timeouts.
Previously I had tried splitting it in half, but it looks like that's
both not enough to avoid timeouts, and it also has a race condition when
trying to run two copies of the test at the same time (one will read the
not-fully-written pickled output of the other).

from_cpython/Lib/test/test_lib2to3.py

+# skip-if: not IS_OPTIMIZED
 # Skipping test_parser and test_all_fixers
 # because of running
 from lib2to3.tests import (test_fixers, test_pytree, test_util, test_refactor,

test/cpython/test_lib2to3.py

+../../from_cpython/Lib/test/test_lib2to3.py
\ No newline at end of file

test/cpython/test_lib2to3_2.py

-# Skipping test_parser and test_all_fixers
-# because of running
-from lib2to3.tests import (test_fixers, test_pytree, test_util, test_refactor,
-                           test_parser, test_main as test_main_)
-import unittest
-from test.test_support import run_unittest
-
-def suite():
-    tests = unittest.TestSuite()
-    loader = unittest.TestLoader()
-    for m in (test_refactor, test_parser, test_main_):
-        tests.addTests(loader.loadTestsFromModule(m))
-    return tests
-
-def test_main():
-    run_unittest(suite())
-
-
-if __name__ == '__main__':
-    test_main()

test/cpython/test_lib2to3_1.py → test/cpython/test_lib2to3_small.py

+# skip-if: IS_OPTIMIZED
 # Skipping test_parser and test_all_fixers
 # because of running
 from lib2to3.tests import (test_fixers, test_pytree, test_util, test_refactor,
@@ -8,7 +9,7 @@ from test.test_support import run_unittest
 def suite():
     tests = unittest.TestSuite()
     loader = unittest.TestLoader()
-    for m in (test_fixers, test_pytree, test_util):
+    for m in (test_parser,):
         tests.addTests(loader.loadTestsFromModule(m))
     return tests
 

tools/tester.py

@@ -514,6 +514,7 @@ def main(orig_dir):
     global EXTMODULE_DIR_PYSTON
     global EXTMODULE_DIR
     global DISPLAY_SUCCESSES
+    global IS_OPTIMIZED
 
     run_memcheck = False
 
@@ -537,6 +538,8 @@ def main(orig_dir):
     EXTMODULE_DIR = os.path.abspath(os.path.dirname(os.path.realpath(IMAGE)) + "/test/test_extension/build/lib.linux-x86_64-2.7/")
     patterns = opts.pattern
 
+    IS_OPTIMIZED = int(subprocess.check_output([IMAGE, "-c", 'import sysconfig; print int("-O0" not in sysconfig.get_config_var(\"CFLAGS\"))']))
+
     if not patterns and not TESTS_TO_SKIP:
         TESTS_TO_SKIP = ["t", "t2", "t3"]