perf: String hashing, creation and concatenating #560
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String hashing is currently always iterating the string twice: Once for
as_strand once forhash.String creation was also hashing twice: Once to lookup an existing string and once to store a new string.
String concatenation could also be optimised.
I also mildly refactored instruction fetching to make it a bit nicer, also a bit more performant if my quick check is correct.