[clang] Add support for lifetime capture_by (PR #196884)

[Gábor Horváth via cfe-commits]

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@@ -864,6 +864,74 @@ void FactsGenerator::handleImplicitObjectFieldUses(const Expr *Call,
   });
 }
 
+void FactsGenerator::handleLifetimeCaptureBy(const FunctionDecl *FD,
+                                             ArrayRef<const Expr *> Args) {
+  bool isInstance = false;
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Xazax-hun wrote:

I wonder if a more elegant way to handle `isInstance` would be to create an `ArrayRef` that is a sub-range. I.e., dropping the first element of `Args`.  (Not hundred percent sure if it would simplify much.)

https://github.com/llvm/llvm-project/pull/196884