ci/bench.sh: Try function instead of alias

Author: nhooyr

ci/bench.sh

@@ -13,7 +13,7 @@ go test --run=^$ --bench=. --benchmem "$@" ./...
     if [ "${CI-}" ]; then
       sudo apt-get update
       sudo apt-get install -y qemu-user-static
-      alias qemu-aarch64=qemu-aarch64-static
+      qemu-aarch64() { qemu-aarch64-static "$@" }
     fi
     qemu-aarch64 ../../ci/out/thirdparty-arm64.test --test.run=^$ --test.bench=Benchmark_mask --test.benchmem
   fi