[Strings] string.is_usv_sequence #4783
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This implements it as a StringMeasure opcode. They do have the same number of
operands, same trapping behavior, and same return type. They both get a string and
do some inspection of it to return an
i32. Perhaps the name could beStringInspector something like that, rather than
StringMeasure..? But I think for now this might begood enough, and the spec may change anyhow later.