[PyTorch Edge] Move torch::jit::mobile::_export_operator_list() from serialization/export_module.cpp to mobile/import.cpp

[dhruvbird]

Stack from ghstack:

• [PyTorch Edge] Move torch::jit::mobile::_export_operator_list() from serialization/export_module.cpp to mobile/import.cpp #56044 [PyTorch Edge] Move torch::jit::mobile::_export_operator_list() from serialization/export_module.cpp to mobile/import.cpp

We want to be able to drop the dependence of full-jit deps in the auto-generated unit tests for 2 reasons:

1. Running bloaty on the auto-generated unit tests should be somewhat representative of the actual size.
2. The runtime environment of the auto-generated unit tests should be as close to the production environment as possible to ensure that we are running the tests in a production-like runtime.

Due to the dependece on full-jit, we aren't there yet. For the auto-generated tests, we probably don't need to depend on _export_operator_list() evetually, but for now we do since it is used to decide whether the model being run is a Metal GPU model or a CPU model, and gates whether the test runs that model or not.

Eventually, we can stop doing this in the test and do it in the codegen from PTM-CLI instead (by fetching the operators from that tool, and writing out to the BUCK file which backend(s) this model is targeting). However, that will take some time to land, so in the spirit of expediency, this change is being proposed.

Discussed this offline with @myuan

Differential Revision: D27694781

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💊 CI failures summary and remediations

As of commit 42d1bf6 (more details on the Dr. CI page):

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• 2/2 failures introduced in this PR

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🕵️ 2 new failures recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

pytorch_doc_test (1/2)

Step: "Doc test" (full log | diagnosis details | 🔁 rerun)

Apr 15 22:14:31 sccache: error: couldn't connect to server

Apr 15 22:14:31 ++++ eval 'extract_trap_cmd '
Apr 15 22:14:31 +++++ extract_trap_cmd
Apr 15 22:14:31 +++++ printf '%s\n' ''
Apr 15 22:14:31 ++++ printf '%s\n' cleanup
Apr 15 22:14:31 +++ trap -- '
Apr 15 22:14:31 cleanup' EXIT
Apr 15 22:14:31 +++ [[ pytorch-linux-xenial-py3.6-gcc5.4-build != *pytorch-win-* ]]
Apr 15 22:14:31 +++ which sccache
Apr 15 22:14:31 +++ sccache --stop-server
Apr 15 22:14:31 Stopping sccache server...
Apr 15 22:14:31 sccache: error: couldn't connect to server
Apr 15 22:14:31 sccache: caused by: Connection refused (os error 111)
Apr 15 22:14:31 +++ true
Apr 15 22:14:31 +++ rm /var/lib/jenkins/sccache_error.log
Apr 15 22:14:31 +++ [[ pytorch-linux-xenial-py3.6-gcc5.4-build == *rocm* ]]
Apr 15 22:14:31 +++ SCCACHE_ERROR_LOG=/var/lib/jenkins/sccache_error.log
Apr 15 22:14:31 +++ SCCACHE_IDLE_TIMEOUT=1200
Apr 15 22:14:31 +++ RUST_LOG=sccache::server=error
Apr 15 22:14:31 +++ sccache --start-server
Apr 15 22:14:31 sccache: Starting the server...
Apr 15 22:14:31 +++ sccache --zero-stats

pytorch_python_doc_build (2/2)

Step: "Doc Build and Push" (full log | diagnosis details | 🔁 rerun)

Apr 15 22:23:39 Makefile:38: recipe for target 'html' failed

Apr 15 22:23:37 
Apr 15 22:23:37 copying static files... ... done
Apr 15 22:23:37 copying extra files... done
Apr 15 22:23:38 dumping search index in English (code: en)... done
Apr 15 22:23:38 dumping object inventory... done
Apr 15 22:23:38 build finished with problems, 1 warning.
Apr 15 22:23:38 /var/lib/jenkins/workspace/docs/src/pytorch-sphinx-theme/pytorch_sphinx_theme/search.html:21: RemovedInSphinx30Warning: To modify script_files in the theme is deprecated. Please insert a <script> tag directly in your theme instead.
Apr 15 22:23:38   <p class="last">
Apr 15 22:23:38 /var/lib/jenkins/workspace/docs/src/pytorch-sphinx-theme/pytorch_sphinx_theme/search.html:24: RemovedInSphinx30Warning: To modify script_files in the theme is deprecated. Please insert a <script> tag directly in your theme instead.
Apr 15 22:23:38   </p>
Apr 15 22:23:39 Makefile:38: recipe for target 'html' failed
Apr 15 22:23:39 make: *** [html] Error 1
Apr 15 22:23:39 =========================
Apr 15 22:23:39 ++ code=2
Apr 15 22:23:39 ++ '[' 2 -ne 0 ']'
Apr 15 22:23:39 ++ set +x
Apr 15 22:23:39 ++ return 2
Apr 15 22:23:39 WARNING: autodoc: failed to import module 'launch' from module 'torch.distributed'; the following exception was raised:
Apr 15 22:23:39 =========================
Apr 15 22:23:39 Docs build failed. If the failure is not clear, scan back in the log
Apr 15 22:23:39 for any WARNINGS or for the line build finished with problems

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This pull request has been merged in bd3c63a.