[ET-VK] Refactor Context::flush() and make ComputeGraph destructor exception-safe #17191
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…ception-safe Refactored Context::flush() by extracting two new public functions: - wait_for_queue(): blocks until the GPU queue is idle - clear_resources(): clears command/descriptor pools and cleanup lists This allows callers to use these operations independently. ComputeGraph's destructor now uses these functions directly and wraps them in try/catch blocks to ensure it never throws exceptions, following C++ best practices for destructors. Authored with Claude. Differential Revision: [D92171362](https://our.internmc.facebook.com/intern/diff/D92171362/) ghstack-source-id: 337901647 Pull Request resolved: #17158
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17191
Note: Links to docs will display an error until the docs builds have been completed. ❌ 3 New FailuresAs of commit 652ae23 with merge base 593775b ( NEW FAILURES - The following jobs have failed:
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #17158 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/402/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/402/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/402/orig
Differential Revision: D92171362
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