[PATCH] D78658: [clang][Frontend] Add missing error handling

[LemonBoy via Phabricator via cfe-commits]

LemonBoy created this revision.
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Some early errors during the ASTUnit creation were not transferred to the `FailedParseDiagnostic` so when the code in `LoadFromCommandLine` swaps its content with the content of `StoredDiagnostics` they cannot be retrieved by the user in any way.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78658

Files:
  clang/lib/Frontend/ASTUnit.cpp
  clang/unittests/Frontend/ASTUnitTest.cpp

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