gas: add tests for BPF V3 atomic instructions 2023-05-10 Jose E. Marchesi <jose.marchesi@oracle.com> * testsuite/gas/bpf/atomic-v3.s: New file. * testsuite/gas/bpf/atomic-v3.d: Likewise. * testsuite/gas/bpf/atomic-v3-be.d: Likewise. * testsuite/gas/bpf/bpf.exp: Run atomic-v3 and atomic-v3-be.