Use make's -C option to enter directories.

Also, do not try to remove build/ dir when
cleaning, this does not exist any more.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48599 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile b/Makefile
index e5333ee..06eeeae 100644
--- a/Makefile
+++ b/Makefile
@@ -4,13 +4,12 @@
 include $(LEVEL)/Makefile.common
 
 test::
-	@ cd test && $(MAKE) -f Makefile.parallel
+	@ $(MAKE) -C test -f Makefile.parallel
 
 report::
-	@ cd test && $(MAKE) -f Makefile.parallel report
+	@ $(MAKE) -C test -f Makefile.parallel report
 
 clean::
-	@ rm -rf build
-	@ cd test && $(MAKE) -f Makefile.parallel clean
+	@ $(MAKE) -C test -f Makefile.parallel clean
 
 .PHONY: test report clean