Function IsSurrogate

deps/v8/test/mjsunit/wasm/stringrefs-exec-gc.js:56–58

(codepoint)

];

function IsSurrogate(codepoint) {
  return 0xD800 <= codepoint && codepoint <= 0xDFFF
}
function HasIsolatedSurrogate(str) {
  for (let codepoint of str) {
    let value = codepoint.codePointAt(0);