Add testcases for "compare and swap".


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12595 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index 5b46244..13c4a95 100644
--- a/configure.in
+++ b/configure.in
@@ -2196,6 +2196,7 @@
    memcheck/tests/x86-linux/Makefile
    memcheck/tests/ppc32/Makefile
    memcheck/tests/ppc64/Makefile
+   memcheck/tests/s390x/Makefile
    cachegrind/Makefile
    cachegrind/tests/Makefile
    cachegrind/tests/x86/Makefile