[PATCH] D130705: [clang][ASTImporter] Improve import of functions with auto return type.

[Balázs Kéri via Phabricator via cfe-commits]

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ASTImporter used to crash in some cases when a function is imported with
`auto` return type and the return type has references into the function.
The handling of such cases is improved and crash should not occur any more
but it is not fully verified, there are very many different types of
cases to care for.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130705

Files:
  clang/lib/AST/ASTImporter.cpp
  clang/unittests/AST/ASTImporterTest.cpp

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