Function Wtf8StartsCodepoint

deps/v8/test/mjsunit/wasm/stringrefs-exec.js:946–948

(wtf8, offset)

    ]);

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