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[mlir][tosa] Added div op, variadic concat. Removed placeholder. Spec v0.22…

Authored by rsuderman on May 6 2021, 3:55 PM.

Description

[mlir][tosa] Added div op, variadic concat. Removed placeholder. Spec v0.22 alignment.

Nearly complete alignment to spec v0.22

  • Adds Div op
  • Concat inputs now variadic
  • Removes Placeholder op

Note: TF side PR https://github.com/tensorflow/tensorflow/pull/48921 deletes Concat legalizations to avoid breaking TensorFlow CI. This must be merged only after the TF PR has merged.

Reviewed By: rsuderman

Differential Revision: https://reviews.llvm.org/D101958