lit: Add a custom test format for use in clang.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81987 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/lit/LitFormats.py b/utils/lit/LitFormats.py
index e22f84b..9b8250d 100644
--- a/utils/lit/LitFormats.py
+++ b/utils/lit/LitFormats.py
@@ -1,2 +1,2 @@
-from TestFormats import GoogleTest, ShTest, TclTest
+from TestFormats import GoogleTest, ShTest, TclTest, SyntaxCheckTest