[C++20][Modules] Fix crash/compiler error due broken AST links (#123648) Summary: This PR fixes bugreport https://github.com/llvm/llvm-project/issues/122493 The root problem is the same as before lambda function and DeclRefExpr references a variable that does not belong to the same module as the enclosing function body. Therefore iteration over the function body doesn’t visit the VarDecl. Before this change RelatedDeclsMap was created only for canonical decl but in reality it has to be done for the definition of the function that does not always match the canonical decl. Test Plan: check-clang
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