[asan] Disable non-execute test on s390
Processors before z14 don't support non-execute protection,
so they will start execution random memory contents, causing
the test to randomly fail or succeed.
// Not every OS lists every memory region in MemoryMappingLayout.
// REQUIRES: linux || freebsd || netbsd
+// We don't have non-execute protection on s390 processors before z14.
+// UNSUPPORTED: s390
+
#include <assert.h>
typedef void void_f();
