Add build_optimized_size_test.sh

[swolchok]

Adding a developer-facing size test script for a non-embedded-centric use case (optimized ops, exceptions on, etc.).

[swolchok]

Stack from ghstack (oldest at bottom):

• Add vectorization in elementwise_util #9432
• BroadcastIndexesRange: leading 1s don't require true broadcasting #9431
• Save some size in dtype_util when dtype selective build is not in use #9842
• Migrate elementwise_util callers to the variants with out_dtypes in template arguments #9841
• RFC: Specialize for non-mixed-dtype in elementwise_util #9388
• Refactor elementwise_util: create variants with out_dtypes in template argument list #9387
• -> Add build_optimized_size_test.sh #9840
• set INTERFACE_LINK_LIBARIES for extension_threadpool #9839
• Fix build gating on optimized_portable_kernels #9838
• Make PyTorch headers available in optimized_portable_kernels, define ET_USE_PYTORCH_HEADERS #9384

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9840

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[kirklandsign]

How do we trigger this? Add it to CI? Also is it possible to re-use https://github.com/pytorch/executorch/blob/main/test/build_size_test.sh?

[swolchok]

How do we trigger this? Add it to CI?

As the description says, it is meant for development use.

is it possible to re-use

No, that script wants to disable exceptions, which is appropriate in the embedded systems context but not the "everything else" context. Optimized kernels are not for the embedded systems context AIUI.