fix(new): production build is breaking angular child components

[MRHarrison]

Set keep_fnames: true fixes the issue.

Similar to the issues found here:
mishoo/UglifyJS#999
angular/angular#10618 (comment)

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CLAs look good, thanks!

[filipesilva]

According to angular/angular#10618 (comment) and #1937 this should not be a problem anymore since RC6.

Can you provide a repro where this problem is still manifest?

[filipesilva]

Closed as inactive.

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