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[mlir] Async: add automatic reference counting at async.runtime operations level

Authored by ezhulenev on Apr 12 2021, 10:48 AM.

Description

[mlir] Async: add automatic reference counting at async.runtime operations level

Depends On D95311

Previous automatic-ref-counting pass worked with high level async operations (e.g. async.execute), however async values reference counting is a runtime implementation detail.

New pass mostly relies on the save liveness analysis to place drop_ref operations, and does better verification of CFG with different liveIn sets in block successors.

This is almost NFC change. No new reference counting ideas, just a cleanup of the previous version.

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D95390

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