Bixia Zheng 746c68eafd [mlir][sparse][taco] Handle tensor copy and trivial reduction expression.
Handle tensor copy, such as A[i, j] = B[i, j]. Also, handle trivial
reduction expression, such as A[i] = B[i, j].

Add unit tests.

Reviewed By: aartbik

Differential Revision: https://reviews.llvm.org/D119867
2022-02-15 15:57:18 -08:00
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