Topic/fix same instance

[bosilca]

Multiple fixes again main:

1. the collective embiggening missed one spot in alltoallv where the array of counts was directly accessed.
2. the patch to match check if the requests were from the same instance was incorrect, it checked if they were issued on the same communicator instead.

[edgargabriel]

@bosilca Does the alltoallv commit belong into this pr, or did it accidentally slip in?
And just to confirm, the fix for the same instance issue here, that is more of an optimization than an actual fix, isn't it?

[bosilca]

@edgargabriel you are right, they are not related. They were all discovered on the same session on a machine with limited access outside, it was easier to bundle everything in a single PR.

[edgargabriel]

@bosilca may I suggest that you at least spell this out in the pr description, that two different issues are tackled here? (In addition, I would also still be interested in the answer to my other question, whether this is more of an optimization vs. an actual bug fix)

[bosilca]

@edgargabriel sorry I missed your second question. It is a bug fix, the current code checks if the PML requests are issued on the same communicator instead of the same instance.

[edgargabriel]

@bosilca ok, sounds good, thank you. In that case I need to pull this pr also in into our internal repo :-)