[fusl] Add llvm's lit tool to third_party

third_party/lit/tests/lit.cfg

+# -*- Python -*-
+
+import os
+import sys
+
+import lit.formats
+
+# Configuration file for the 'lit' test runner.
+
+# name: The name of this test suite.
+config.name = 'lit'
+
+# testFormat: The test format to use to interpret tests.
+config.test_format = lit.formats.ShTest(execute_external=False)
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = ['.py']
+
+# excludes: A list of individual files to exclude.
+config.excludes = ['Inputs']
+
+# test_source_root: The root path where tests are located.
+config.test_source_root = os.path.dirname(__file__)
+config.test_exec_root = config.test_source_root
+
+config.target_triple = '(unused)'
+
+src_root = os.path.join(config.test_source_root, '..')
+config.environment['PYTHONPATH'] = src_root
+config.substitutions.append(('%{src_root}', src_root))
+config.substitutions.append(('%{inputs}', os.path.join(
+            src_root, 'tests', 'Inputs')))
+config.substitutions.append(('%{lit}', "%%{python} %s" % (
+            os.path.join(src_root, 'lit.py'),)))
+config.substitutions.append(('%{python}', sys.executable))
+
+# Enable coverage.py reporting, assuming the coverage module has been installed
+# and sitecustomize.py in the virtualenv has been modified appropriately.
+if lit_config.params.get('check-coverage', None):
+    config.environment['COVERAGE_PROCESS_START'] = os.path.join(
+        os.path.dirname(__file__), ".coveragerc")
+
+# Add a feature to detect the Python version.
+config.available_features.add("python%d.%d" % (sys.version_info[0],
+                                                  sys.version_info[1]))