[PATCH v9 16/16] selftests: sud_test: Support aarch64

[kemal]

You should also make sure TEST_BLOCKED_RETURN is defined in
sud_benchmark.c:

/*
 * To test returning from a sigsys with selector blocked, the test
 * requires some per-architecture support (i.e. knowledge about the
 * signal trampoline address).  On i386, we know it is on the vdso, and
 * a small trampoline is open-coded for x86_64.  Other architectures
 * that have a trampoline in the vdso will support TEST_BLOCKED_RETURN
 * out of the box, but don't enable them until they support syscall user
 * dispatch.
 */
#if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
#define TEST_BLOCKED_RETURN
#endif