Adding CloneToConsumersPass and ElideAsyncTransfersPass. #20103
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These transfers can arise during stream conversion if there was ambiguity in the source IR.
This performs affinity analysis and clones any clonable producer that is used by multiple affinities per-user. It's effectively the inverse of a CSE step and is intended to undo CSE that created the affinity ambiguity. The primary case where this arises today is CSE collapsing a splat or splat-like dispatch that is consumed by transfers or dispatches on different affinities.
I do not recall why there was a carveout for constants.
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CloneToConsumersPass performs affinity analysis and clones any clonable producer that is used by multiple affinities per-user. It's effectively the inverse of a CSE step and is intended to undo CSE that created the affinity ambiguity. ElideAsyncTransfersPass does a global analysis to try to find transfers that are redundant and elides them.
The primary case where this arises today is CSE collapsing a splat or splat-like dispatch that is consumed by transfers or dispatches on different affinities.