[lit] Inject the lit specific config object as 'lit_config' when loading config files.

- Injecting it as 'lit' is gross, since that name should be used to refer to
   the actual package. For now both are available so it is possibly to cleanup
   test config files incrementally.

llvm-svn: 188039

llvm/utils/lit/lit/TestingConfig.py

@@ -75,6 +75,7 @@ class TestingConfig:
         cfg_globals = dict(globals())
         cfg_globals['config'] = self
         cfg_globals['lit'] = litConfig
+        cfg_globals['lit_config'] = litConfig
         cfg_globals['__file__'] = path
         try:
             if PY2: