Emil Kieri b85922cde6 [flang] Include missing internal interfaces in .mod files
Interfaces which are internal to a procedure need to be included in
module files if (and only if) they are referenced in the interface of
the procedure. That is, they are needed if they are the interfaces of
dummy or return value procedures.

Fixes #53420

Differential Revision: https://reviews.llvm.org/D121738
2022-03-16 21:36:02 +01:00
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