Tim Keith bf0870d864 [flang] Fix bug in IMPLICIT NONE(EXTERNAL) ...

We were only checking the restrictions of IMPLICIT NONE(EXTERNAL) when a
procedure name is first encountered. But it can also happen with an
existing symbol, e.g. if an external function's return type is declared
before is it called. This change adds a check in that branch too.

Differential Revision: https://reviews.llvm.org/D93552

2020-12-18 17:43:53 -08:00

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