[Asan] Fix the tsd_dtor_leak.cc test to pass on FreeBSD

[kutuzov.viktor.84]

Summary

On FreeBSD SYSCALL(sched_yielld) allocates some more space during the 2nd attempt.

[samsonov]

LGTM

test/asan/TestCases/Posix/tsd_dtor_leak.cc

38

Please add a comment about why you need this on FreeBSD.

test/asan/TestCases/Posix/tsd_dtor_leak.cc

int main() {
   for (int i = 0; i < 10; i++) {
     pthread_t t;
     pthread_create(&t, 0, Thread, 0);
     pthread_join(t, 0);
     size_t new_heap_size = __sanitizer_get_heap_size();
     fprintf(stderr, "heap size: new: %zd old: %zd\n", new_heap_size, old_heap_size);
     if (old_heap_size)
       assert(old_heap_size == new_heap_size);
+#if defined(__FreeBSD__)
+    if (i > 0)
       old_heap_size = new_heap_size;
+#else
+    old_heap_size = new_heap_size;
+#endif
   }
 }