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Coll han: fix allreduce dynamic calling internal han algo on sub_comm
Fix for #8248 (a little bit late). This PR reactivates the dynamic mechanism and corrects the initial bug. To make it simple, the dynamic had a bug that caused a call to an internal han implementation on a sub_communicator but with a wrong module, leading to a segfault.
Can one of the admins verify this patch?
ok to test
bot:ibm:retest
bot:ibm:retest
Can this get a review?
@bosilca ?
@bosilca is this good to go?
@bosilca ping do you agree with the change?
@FlorentGermain-Bull Can you rebase this PR so that it picks up the new CI? Thanks!