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[MLIR][SCF] Parenthesize multiple return types in scf.execute_region asm op

Authored by mortbopet on Aug 19 2021, 12:34 PM.

Description

[MLIR][SCF] Parenthesize multiple return types in scf.execute_region asm op

Previously, ExecuteRegionOps with multiple return values would fail a round-trip test due to missing parenthesis around the types.

Differential Revision: https://reviews.llvm.org/D108402