[PATCH] D154709: [clang][ASTImporter] Add a 'Message' member to ASTImportError use it throught ASTImporter

[Michael Buch via Phabricator via cfe-commits]

Michael137 created this revision.
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This patch adds a new `ASTImportError::Message` which is used
to more accurately describe a failure when `ASTImportError::log`
is called. We then set this error message throughout ASTImporter.

The motivation for this is that in upcoming patches LLDB will
check `ASTImportError`s and log them on failures. At the moment
these logs wouldn't be helpful since we wouldn't be able to
differentiate between the different conflicts that occur
during a single import process.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154709

Files:
  clang/include/clang/AST/ASTImportError.h
  clang/lib/AST/ASTImporter.cpp

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