[flang-commits] [flang] [Flang][Semantics] Fix incorrect merging of separate module procedure interfaces during USE association (PR #197173)

[Eugene Epshteyn via flang-commits]

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eugeneepshteyn wrote:

What about this case:
```
module parent_mod_9
   interface
      module subroutine inside_one()
      end subroutine
   end interface
 end module

 submodule (parent_mod_9) sub_9
 contains
   subroutine inside_one()
   end subroutine
 end submodule
```
Here I think it's an opposite problem: the interface for `inside_one()` has `module`, but the submodule doesn't, so submodule's implementation is not in fact implementation of the interface. I think a similar warning should be also generated in this case.

https://github.com/llvm/llvm-project/pull/197173