function parseBitwiseOr(state) {
    var node = parseBitwiseXor(state);

    while (state.token === '|') {
      // eslint-disable-line no-unmodified-loop-condition
      getTokenSkipNewline(state);
      node = new OperatorNode('|', 'bitOr', [node, parseBitwiseXor(state)]);
    }

    return node;
  }
bitwise or, 'x | y'
@return {Node} node
@private