reduce chattyness of makefiles

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48597 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile b/Makefile
index b1279a6..e5333ee 100644
--- a/Makefile
+++ b/Makefile
@@ -4,11 +4,13 @@
 include $(LEVEL)/Makefile.common
 
 test::
-	cd test && $(MAKE) -f Makefile.parallel
+	@ cd test && $(MAKE) -f Makefile.parallel
 
 report::
-	cd test && $(MAKE) -f Makefile.parallel report
+	@ cd test && $(MAKE) -f Makefile.parallel report
 
 clean::
-	@rm -rf build
-	@rm -rf `find test -name Output`
+	@ rm -rf build
+	@ cd test && $(MAKE) -f Makefile.parallel clean
+
+.PHONY: test report clean