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[mlir] Extended Liveness analysis to support nested regions.

Authored by dfki-mako on Apr 8 2020, 1:31 AM.

Description

[mlir] Extended Liveness analysis to support nested regions.

The current Liveness analysis does not support operations with nested regions.
This causes issues when querying liveness information about blocks nested within
operations. Furthermore, the live-in and live-out sets are not computed properly
in these cases.

Differential Revision: https://reviews.llvm.org/D77714