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[mlir][ArmSVE] Add basic mask generation operations

Authored by jsetoain on Apr 22 2021, 1:29 AM.

Description

[mlir][ArmSVE] Add basic mask generation operations

These arm_sve.cmp functions are needed to generate scalable vector
masks as long as scalable vectors are not part of the standard types.
Once in standard, these can be removed and std.cmp can be used
instead.

Differential Revision: https://reviews.llvm.org/D103473