Function demangle

mkbitmap/mkbitmap.js:1818–1821

(func)

  var ERRNO_CODES = {};
  
  function demangle(func) {
      warnOnce('warning: build with -sDEMANGLE_SUPPORT to link in libcxxabi demangling');
      return func;
    }
  function demangleAll(text) {
      var regex =
        /\b_Z[\w\d_]+/g;