Tim Keith 6f300105d2 [flang] Fix bug with IMPORT of USE of USE ...

When a module contained an import of a use-association of a
use-association, we weren't recognizing that the symbols was needed.
The fix is the follow all of the use-associations using `GetUltimate()`.

Differential Revision: https://reviews.llvm.org/D79737

2020-05-11 13:28:07 -07:00

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