[PATCH] D120824: [clang][ASTImporter] Fix a bug when importing CXXDefaultInitExpr.

[Balázs Kéri via Phabricator via cfe-commits]

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The "in-class initializer" expression should be set in the field of a
default initialization expression before this expression node is created.
The `CXXDefaultInitExpr` objects are created after the AST is loaded and
at import not present in the "To" AST. And the in-class initializers of
the used fields can be missing too, these must be set at import.

This fixes a github issue #54061.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120824

Files:
  clang/lib/AST/ASTImporter.cpp
  clang/test/Analysis/Inputs/ctu-cxxdefaultinitexpr-import.cpp
  clang/test/Analysis/ctu-cxxdefaultinitexpr.cpp
  clang/unittests/AST/ASTImporterTest.cpp

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