Dependency sorting broken since release v20170626

[AlastairTaft]

The following command works on version v20170521, however it falls over on version v20170626 through to the latest.

java -jar ./tools/closure-compiler/v20170521.jar --language_in=ECMASCRIPT6 --js_output_file=build/bundle.js --dependency_mode=STRICT --entry_point=src/index.js --js src/index.js --js src/orange.js --js src/apple.js

Falls over with

ERROR - required "module$src$apple" namespace never provided
import apple from './apple.js'

I'm using the ES6 import/export statements.

// index.js

import apple from './apple.js'

console.log(apple.getColour())

// apple.js


console.log('apple loaded')

import orange from './orange.js'

var apple = {}

apple['getColour'] = function(){
  return 'Green'
}

apple['getType'] = function(){
  return 'Granny Smith'
}

export default apple

// orange.js

console.log('Oranges loaded')

var test = {}

export default test

[ChadKillingsworth]

This is fixed by #2641