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[mlir][Inliner] Refactor the inliner to use nested pass pipelines instead of…

Authored by rriddle on Dec 14 2020, 6:07 PM.

Description

[mlir][Inliner] Refactor the inliner to use nested pass pipelines instead of just canonicalization

Now that passes have support for running nested pipelines, the inliner can now allow for users to provide proper nested pipelines to use for optimization during inlining. This revision also changes the behavior of optimization during inlining to optimize before attempting to inline, which should lead to a more accurate cost model and prevents the need for users to schedule additional duplicate cleanup passes before/after the inliner that would already be run during inlining.

Differential Revision: https://reviews.llvm.org/D91211