make the vtable tester a little friendlier, with a clean target and without requiring . to be in your path

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99433 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/VtableTest/Makefile b/utils/VtableTest/Makefile
index 0e06026..dd615ae 100644
--- a/utils/VtableTest/Makefile
+++ b/utils/VtableTest/Makefile
@@ -5,17 +5,20 @@
 
 test.cc: gen.cc
 	g++ gen.cc -o gen
-	gen >test.cc
+	./gen >test.cc
 
 test-gcc.sum: test.cc
 	time $(GXX) test.cc -o test-gcc.s -S
 	$(GXX) test-gcc.s -o test-gcc
-	test-gcc >test-gcc.sum
+	./test-gcc >test-gcc.sum
 
 test-clang.sum: test.cc
 	time $(CLANGXX) test.cc -o test-clang.s -S
 	$(CLANGXX) test-clang.s -o test-clang
-	test-clang >test-clang.sum
+	./test-clang >test-clang.sum
 
 one: test-gcc.sum test-clang.sum
 	cmp test-gcc.sum test-clang.sum
+
+clean:
+	rm -f gen test-gcc test-clang test.cc test-gcc.sum test-clang.sum test-gcc.s test-clang.s