[MultiProcessTestCase] Improve the error message when a process terminates (#37627)
Summary:
When a subprocess terminates with an exception in a distributed test, log the process number as well
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37627
Differential Revision: D21366149
Pulled By: rohan-varma
fbshipit-source-id: 132c4b4c1eb336761c2be26d034d8b739ae19691
