perf: move es6-shim to core-js (new stuff only)

[hansl]

Fixes #851.

[filipesilva]

@hansl core-js also includes reflect-metadata, I tested it myself. Can you remove it as well in this PR?

[Shyam-Chen]

Hello, I would like to help you for this.

[briananderson1222]

👍 This is essential for working with IE

[briananderson1222]

Any reason this is being held up?

For those who are having major slow-downs on IE9-11 I ended up removing es6-shim and reflect-metadata, adding core-js (including in the vendorNpmFiles array), and adding the following to the angular-cli-build.js file after the vendorNpmFiles array.

polyfills: [
      'vendor/core-js/client/shim.min.js',
      'vendor/systemjs/dist/system.src.js',
      'vendor/zone.js/dist/zone.js'
    ]

been running this setup for almost a month now with no issues and extreme performance enhancements in IE9-11

[coryrylan]

@filipesilva (updated) if this pull request is stale I'd like to take a shot at getting a PR in and get reflect-metadata removed.

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