Alex Rickabaugh a8fced8846 refactor(ivy): abstract .d.ts file transformations (#34235)
This commit refactors the way the compiler transforms .d.ts files during
ngtsc builds. Previously the `IvyCompilation` kept track of a
`DtsFileTransformer` for each input file. Now, any number of
`DtsTransform` operations that need to be applied to a .d.ts file are
collected in the `DtsTransformRegistry`. These are then ran using a
single `DtsTransformer` so that multiple transforms can be applied
efficiently.

PR Close #34235
2019-12-10 16:34:46 -08:00
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