caffe2/plan_executor: propagate exceptions from reporter substeps (#46424)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46424
Currently if an exception occurs in a reporter thread the process is killed via std::terminate. This adds support for handling the reporter exception if FLAGS_caffe2_handle_executor_threads_exceptions is set to true.
Test Plan: buck test mode/opt -c python.package_style=inplace //caffe2/caffe2/python:hypothesis_test //caffe2/caffe2:caffe2_test_cpu -- --stress-runs 100
Reviewed By: dahsh
Differential Revision: D24345027
fbshipit-source-id: 0659495c9e27680ebae41fe5a3cf26ce2f455cb3
