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WIP: Event manager allocations

Andrew Martin requested to merge andrewthad/ghc:event_manager_allocations into master

This is still very much a work in progress, so I'm not requesting that anyone review this yet. I'm trying to get rid of the small unneeded allocations in the event manager. So far, I'm observing a 15-20% reduction in allocations. I've not seen this improve performance, but I suspect that as I push the allocations down even lower, the reduced indirections that accompany these changes will lead to some measurable performance gains.

Edited by Matthew Pickering

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