add sv utf-8 discussion

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+# UTF-8 SV
+
+http://lists.libre-soc.org/pipermail/libre-soc-dev/2020-October/001000.html
+
+urns out that is a somewhat different link than the one I thought I
+linked to, the one I intended to link to covers full vectorized
+validation including non-ASCII UTF-8, rather than just vectorizing a
+check-for-ASCII.
+
+I think this is it:
+https://arxiv.org/pdf/2010.03090.pdf