[issue12073] regrtest: use faulthandler to dump the tracebacks on SIGUSR1

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Update the patch and describe the new feature in regrtest doc (--help).

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Added file: http://bugs.python.org/file22067/regrtest_sigusr1-2.patch

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