code: function isWhitespace(cp) {
      return cp === $.SPACE || cp === $.LINE_FEED || cp === $.TABULATION || cp === $.FORM_FEED;
  }
docs: OPTIMIZATION: these utility functions should not be moved out of this module. V8 Crankshaft will not inline this functions if they will be situated in another module due to context switch. Always perform inlining check before modifying this functions ('node --trace-inlining').