liqinweng 5c18ae3135 [MLIR][Tensor] Canonicalize expand/collapse_shape of splat to splat
Collapsing / expanding a splatted value can be replaced with a single `tensor.splat` operation. Replace
these cases with a simple `tensor.splat` operation.

Reviewed By: rsuderman

Differential Revision: https://reviews.llvm.org/D140552
2023-01-04 13:07:55 -08:00
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