Animations freeze in safari when using ng serve --prod

[andrewseguin]

I'm submitting a...

[x] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

Safari freezes when performing an animation in an app built with ng build --prod

Expected behavior

Shouldn't freeze

Minimal reproduction of the problem with instructions

https://github.com/andrewseguin/broken-animations
Here's a repo that can be run with ng serve --prod. When the red div is clicked, an animation plays to change it to green. In Safari, this freezes the browser.

Environment

Angular version: 6.0.0-rc.5
CLI: 6.0.0-rc.4

Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [x] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 

[nielsheeren]

I have the same issue with ng build --prod in combination with IE11 and Edge. A development build doesn't freeze those browsers.

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