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[ASTImporter] Corrected import of repeated friend declarations.
Summary:
Import declarations in correct order if a class contains
multiple redundant friend (type or decl) declarations.
If the order is incorrect this could cause false structural
equivalences and wrong declaration chains after import.
Reviewers: a.sidorin, shafik, a_sidorin
Reviewed By: shafik
Subscribers: dkrupp, Szelethus, gamesh411, teemperor, martong, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D75740