[ET-VK][ez] Small fix to SPIR-V compilation artifact caching #9720
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## Context There was a bug in the SPIR-V cache; essentially, once a shader variant is processed it will save the source GLSL to the cache. However, if another variant that uses the same source GLSL then checks the cache, it will think that the source file is unchanged and therefore will not recompile. To fix this, defer saving the source GLSL files only when all shaders have been compiled. Differential Revision: [D71973524](https://our.internmc.facebook.com/intern/diff/D71973524/) ghstack-source-id: 274443433 Pull Request resolved: #9716
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9720
Note: Links to docs will display an error until the docs builds have been completed. ❌ 1 New Failure, 2 PendingAs of commit 68f4d58 with merge base 95702dc ( NEW FAILURE - The following job has failed:
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## Context There was a bug in the SPIR-V cache; essentially, once a shader variant is processed it will save the source GLSL to the cache. However, if another variant that uses the same source GLSL then checks the cache, it will think that the source file is unchanged and therefore will not recompile. To fix this, defer saving the source GLSL files only when all shaders have been compiled. Differential Revision: [D71973524](https://our.internmc.facebook.com/intern/diff/D71973524/)
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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: #9716 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/203/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/203/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/203/orig
@diff-train-skip-merge