Switch to using the new LLVM lit test runner by default.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82405 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Makefile b/test/Makefile
index 88cc955..9ed6834 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -25,7 +25,7 @@
   VGARG=
 endif
 
-ifdef LIT2
+ifndef LIT1
 all:: lit.site.cfg
 	@ echo '--- Running clang tests for $(TARGET_TRIPLE) ---'
 	@ $(LLVM_SRC_ROOT)/utils/lit/lit.py \