fix production build - issue #1644

[abner]

changed mangle configuration to mangle: { screw_ie8 : true, keep_fnames: true } to fix production builds issue - see #1644

[abner]

as we can see in this pull request, this is even the way on angular own build. https://github.com/angular/angular/pull/7988/files

[TheLarkInn]

@hansl This is technically the change we were talking about yesterday.

@abner will you sync your branch with master.

[hansl]

Yes this is what's needed to fix the issue. We can revert it once we support offline compiler

[abner]

ok @TheLarkInn. just did it.

[TheLarkInn]

@abner still looks like this branch is out of date with latest master.

[filipesilva]

@TheLarkInn @abner I'm updating it myself, no worries.

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