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[mlir] add scf.if op canonicalization pattern that removes unused results

Authored by gysit on Oct 11 2020, 1:40 AM.

Description

[mlir] add scf.if op canonicalization pattern that removes unused results

The patch adds a canonicalization pattern that removes the unused results of scf.if operation. As a result, cse may remove unused computations in the then and else regions of the scf.if operation.

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D89029