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[mlir][SideEffects] Replace the old SideEffects dialect interface with the…

Authored by rriddle on Mar 9 2020, 4:01 PM.

Description

[mlir][SideEffects] Replace the old SideEffects dialect interface with the newly added op interfaces/traits.

Summary:
The old interface was a temporary stopgap to allow for implementing simple LICM that took side effects of region operations into account. Now that MLIR has proper support for specifying memory effects, this interface can be deleted.

Differential Revision: https://reviews.llvm.org/D74441