Add 'lit' testing tool.

- make install && man $(llvm-config --prefix)/share/man/man1/lit.1 for more
   information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81190 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/ShTest.py

@@ -0,0 +1,12 @@
+import TestRunner
+
+class ShTest:
+    def __init__(self, execute_external = False, require_and_and = False):
+        self.execute_external = execute_external
+        self.require_and_and = require_and_and
+
+    def execute(self, test, litConfig):
+        return TestRunner.executeShTest(test, litConfig,
+                                        self.execute_external,
+                                        self.require_and_and)
+