Vectorize op_mean fast path with at::vec for innermost-dim reductions (#21986) - #21986

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torch::executor::native::opt_mean_dtype_out(executorch::runtime::KernelRuntimeContext&, executorch::runtime::etensor::Tensor const&, std::optionalexecutorch::runtime::etensor::ScalarType, executorch::runtime::etensor::Tensor&)'"],"failure_context":[],"time":"2026-08-20T20:27:49.000000000Z"},{"workflowId":32414260702,"workflowUniqueId":244285389,"id":96571666438,"runnerName":"i-0c562c6f901e0fedf","authorEmail":"rawatp@meta.com","name":"Cadence Build & Test / hifi-build / hifi4","jobName":"hifi-build / hifi4","conclusion":"failure","completed_at":"2026-08-20T21:34:21.000000000Z","html_url":"https://github.com/pytorch/executorch/actions/runs/32414260702/job/96571666438","logUrl":"https://ossci-raw-job-status.s3.amazonaws.com/log/pytorch/executorch/96571666438","head_branch":"export-D103682580","pr_number":21986,"head_sha":"97bf058d809c07794a8c0e57593be85cc99a14ca","head_sha_timestamp":"2026-08-20T20:27:35Z","failure_captures":["##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step."],"failure_lines":["##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step."],"failure_context":[],"time":"2026-08-20T20:28:22.000000000Z"},{"workflowId":32414260702,"workflowUniqueId":244285389,"id":96571666620,"runnerName":"i-02ea570a27ae314f7","authorEmail":"rawatp@meta.com","name":"Cadence Build & Test / vision-build / vision","jobName":"vision-build / vision","conclusion":"failure","completed_at":"2026-08-20T21:34:20.000000000Z","html_url":"https://github.com/pytorch/executorch/actions/runs/32414260702/job/96571666620","logUrl":"https://ossci-raw-job-status.s3.amazonaws.com/log/pytorch/executorch/96571666620","head_branch":"export-D103682580","pr_number":21986,"head_sha":"97bf058d809c07794a8c0e57593be85cc99a14ca","head_sha_timestamp":"2026-08-20T20:27:35Z","failure_captures":["##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step."],"failure_lines":["##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step."],"failure_context":[],"time":"2026-08-20T20:28:22.000000000Z"}],"FLAKY":[{"workflowId":32414211691,"workflowUniqueId":63454257,"id":96571521024,"runnerName":"i-0549818e7e4709544","authorEmail":"rawatp@meta.com","name":"pull / unittest-editable / windows / windows-job","jobName":"unittest-editable / windows / windows-job","conclusion":"failure","completed_at":"2026-08-20T20:53:55.000000000Z","html_url":"https://github.com/pytorch/executorch/actions/runs/32414211691/job/96571521024","logUrl":"https://ossci-raw-job-status.s3.amazonaws.com/log/pytorch/executorch/96571521024","head_branch":"export-D103682580","pr_number":21986,"head_sha":"97bf058d809c07794a8c0e57593be85cc99a14ca","head_sha_timestamp":"2026-08-20T20:27:35Z","failure_captures":[],"failure_lines":[],"failure_context":[],"time":"2026-08-20T20:27:50.000000000Z"}],"BROKEN_TRUNK":[],"UNSTABLE":[],"UNKNOWN":[],"AWAITING_APPROVAL":[]}