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Unroll and inline strings SSE and AVX #569

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@jpcima jpcima commented Dec 6, 2020

These changes, if working, provide some significant speed boosts on AVX and SSE variants with clang compiler.
It's about 5.7x on SSE and 6.8x on AVX; the old benchmark showed 3.9x and 5.6x.
It follows based on some ideas raised from #faust channel discussion.

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