Disable stack-use-after-return.cc on AArch64.  The test was not testing the right thing before (the call to pthread_attr_setstacksize wasn't doing anything) anyway, and now it's running out of stack due to an unrelated change.
// RUN: %env_asan_opts=detect_stack_use_after_return=1:max_uar_stack_size_log=20:verbosity=1 not %run %t 2>&1 | FileCheck --check-prefix=CHECK-20 %s
// RUN: %env_asan_opts=detect_stack_use_after_return=1:min_uar_stack_size_log=24:max_uar_stack_size_log=24:verbosity=1 not %run %t 2>&1 | FileCheck --check-prefix=CHECK-24 %s
+// This test runs out of stack on AArch64.
+// UNSUPPORTED: aarch64
+
#include <limits.h>
#include <pthread.h>
#include <stdio.h>
