[Transpiling] Rest parameters with async bug

[bluesign]

Minimal test case:

export const brokenArgsRest = async (...props) => {
  await someAsyncFunction(async () => {  
      console.log(props)
  })
}

export const someAsyncFunction = async callback => {
  await callback()
}

generates

var brokenArgsRest = function brokenArgsRest() {
  return Promise.resolve(someAsyncFunction(function () {
    try {
      var _arguments2 = arguments;
      console.log([].slice.call(_arguments2));
      return Promise.resolve();
    } catch (e) {
      return Promise.reject(e);
    }
  })).then(function () {});
};
var someAsyncFunction = function someAsyncFunction(callback) {
  try {
    return Promise.resolve(callback()).then(function () {});
  } catch (e) {
    return Promise.reject(e);
  }
};

var _arguments2 = arguments; should be one more level up

Context:
We hit this bug on fcl-js lib : onflow/flow-js-testing#182

PS: my js knowledge is limited, but seems related to inlining somehow.