Misko Hevery d939b5f598 refactor(core): Improve tree shakability of i18n code. (#39301)
`TNode.insertBeforeIndex` is only populated when i18n is present. This
change puts all code which reads `insertBeforeIndex` behind a
dynamically loaded functions which are set only when i18n code executes.

PR Close #39301
2020-10-22 09:35:49 -07:00
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