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[mlir] Allow polynomial approximations for N-d vectors.

Authored by pifon2a on Oct 26 2021, 11:39 AM.

Description

[mlir] Allow polynomial approximations for N-d vectors.

Polynomial approximation can be extented to support N-d vectors.
N-dimensional vectors are useful when vectorizing operations on N-dimensional
tiles. Before lowering to LLVM these vectors are usually unrolled or flattened
to 1-dimensional vectors.

Differential Revision: https://reviews.llvm.org/D112566