[fusl] Add llvm's lit tool to third_party

third_party/lit/lit/formats/shtest.py

Index: third_party/lit/lit/formats/shtest.py
diff --git a/third_party/lit/lit/formats/shtest.py b/third_party/lit/lit/formats/shtest.py
new file mode 100644
index 0000000000000000000000000000000000000000..30a6a3310b011b1385700366e44119693b17e077
--- /dev/null
+++ b/third_party/lit/lit/formats/shtest.py
@@ -0,0 +1,12 @@
+from __future__ import absolute_import
+
+import lit.TestRunner
+from .base import FileBasedTest
+
+class ShTest(FileBasedTest):
+    def __init__(self, execute_external = False):
+        self.execute_external = execute_external
+
+    def execute(self, test, litConfig):
+        return lit.TestRunner.executeShTest(test, litConfig,
+                                            self.execute_external)