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[mlir][linalg] Perform checks early in hoist padding.

Authored by gysit on Thu, Nov 25, 2:37 AM.

Description

[mlir][linalg] Perform checks early in hoist padding.

Instead of checking for unexpected operations (any operation with a region except for scf::For and padTensorOp or operations with a memory effect) while cloning the packing loop nest perform the checks early. Update dropNonIndexDependencies to check for unexpected operations. Additionally, check all of these operations have index type operands only.

Depends On D114428

Reviewed By: nicolasvasilache

Differential Revision: https://reviews.llvm.org/D114438

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