Improve single-thread performance of [SD]GER on A64FX and Neoverse V1 #5515
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Closes #5514
This pull request addresses issue #5514 by implementing loop unrolling of [SD]GER kernels.
This improves DGER single-thread performance by 1.3x on A64FX and 1.2x on Neoverse V1.
A64FX:
Neoverse V1:
