Function Wtf8PositionTreatment

deps/v8/test/mjsunit/wasm/stringrefs-exec.js:949–955

(wtf8, offset)

    return (wtf8[offset] & 0xc0) != 0x80;
  }
  function Wtf8PositionTreatment(wtf8, offset) {
    while (offset < wtf8.length) {
      if (Wtf8StartsCodepoint(wtf8, offset)) return offset;
      offset++;
    }
    return wtf8.length;
  }
  function CodepointStart(wtf8, offset) {
    if (offset >= wtf8.length) return wtf8.length;
    while (!Wtf8StartsCodepoint(wtf8, offset)) {