Paul Gschwendtner 8e55a11283 refactor(core): move schematic base classes logic into shared utils (#35339)
Moves the `findBaseClassDeclarations` method into the shared
schematic utilities. This method will be useful for future
migrations, and for planned changes to the
`undecorated-classes-with-decorated-fields` migration.

PR Close #35339
2020-04-02 10:51:48 -07:00
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