[clang] move ASTImporter into separate library (PR #140913)

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=?utf-8?q?Balázs_Kéri?= <balazs.keri at ericsson.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/140913 at github.com>


cor3ntin wrote:

> The problem was that nodes like `concepts::TypeRequirement` have constructors (and probably other related functions) defined in SemaConcepts.cpp. These can not be linked to the AST library, but are needed in `ASTImporter` for the new import functions.

Can you try to move these to ExprCXX.cpp or ASTConcept.cpp? It would be much cleaner

https://github.com/llvm/llvm-project/pull/140913