Disable test by default

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@364149 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/libcxx/utilities/meta/stress_tests/stress_test_is_same.sh.cpp b/test/libcxx/utilities/meta/stress_tests/stress_test_is_same.sh.cpp
index 8e3f0d1..0f284ba 100644
--- a/test/libcxx/utilities/meta/stress_tests/stress_test_is_same.sh.cpp
+++ b/test/libcxx/utilities/meta/stress_tests/stress_test_is_same.sh.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 //
 // This is a dummy feature that prevents this test from running by default.
-
+// REQUIRES: template-cost-testing
 
 // The table below compares the compile time and object size for each of the
 // variants listed in the RUN script.