Add 'lit' support for llvm tests.
 - This adds 'make check-lit' from the top-level Makefile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81191 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index f697b2d..29adbd8 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -1594,6 +1594,18 @@
 	  $(EchoCmd) No test directory ; \
 	fi
 
+check-lit::
+	$(Verb) if test -d "$(PROJ_OBJ_ROOT)/test" ; then \
+	  if test -f "$(PROJ_OBJ_ROOT)/test/Makefile" ; then \
+	    $(EchoCmd) Running test suite ; \
+	    $(MAKE) -C $(PROJ_OBJ_ROOT)/test check-local-lit ; \
+	  else \
+	    $(EchoCmd) No Makefile in test directory ; \
+	  fi ; \
+	else \
+	  $(EchoCmd) No test directory ; \
+	fi
+
 ###############################################################################
 # UNITTESTS: Running the unittests test suite
 ###############################################################################