Faster c mem{cpy,set}#1473
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Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>
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Switching to picolibc from musl libc regressed c guests performance due to slower mem{set,cpy}.
I think because we infact read most buffers pretty immediately after writing them, so using NT stores does more harming than helping us. Switching memcpy to generic versions instead of machine specific seems to improve performance for us.