[flang] Fix correction of misparsed struct const as actual arg, and semantics...

[flang] Fix correction of misparsed struct const as actual arg, and semantics of MODULE PROCEDURE in INTERFACE

Original-commit: flang-compiler/f18@6c86de6cef0079ef689211c09624ff0e0ecd71a4
Reviewed-on: https://github.com/flang-compiler/f18/pull/477
Tree-same-pre-rewrite: false