cexbrayat fa8216c217 fix(@angular-devkit/build-angular): re-introduce pure_getters
PR #15607 removed the `_pure_getters` optimization as it no longer has effect on the framework size.
But it does have an effect on third party library.

For example a simple project using `@ng-bootstrap/ng-bootstrap` goes from `444K` uncompressed with CLI `9.0.0-next.5` to `488K` with CLI `9.0.0-next.6` which introduced the removal.
2019-10-03 14:29:24 -07:00
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