ARROW-10810: [Rust] Improve comparison kernels performance#8900

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Dandandan wants to merge 6 commits intoapache:masterfrom

Dandandan:comparison_kernels

Commits on Dec 12, 2020

Commits on Dec 13, 2020

Revert debug asserts, add comment about safety
Dandandan
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Commits on Dec 15, 2020

Add safety comment for scalar kenel as well
Dandandan
committed