Function ReplaceIsolatedSurrogates

deps/v8/test/mjsunit/wasm/stringrefs-exec-gc.js:66–73

(str, replacement='\ufffd')

  return false;
}
function ReplaceIsolatedSurrogates(str, replacement='\ufffd') {
  let replaced = '';
  for (let codepoint of str) {
    replaced +=
      IsSurrogate(codepoint.codePointAt(0)) ? replacement : codepoint;
  }
  return replaced;
}

function makeWtf8TestDataSegment() {
  let data = []