Alan Agius 490c24be98 fix(@angular-devkit/build-angular): add sourceMappingURL comment for ES2015 during differential loading
When having differential loading enabled we only add the `sourceMappingURL` comment when optimization is enabled, because we only process these bundles when we enabling optimization.

With this change we now process such bundles even when optimization is disabled and add `sourceMappingURL` when source maps are enabled and not hidden.

Closes #16522
2020-01-02 11:27:27 -08:00
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