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

[Gábor Horváth via cfe-commits]

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@@ -91,6 +91,11 @@ class FactsGenerator : public ConstStmtVisitor<FactsGenerator> {
   void handleMovedArgsInCall(const FunctionDecl *FD,
                              ArrayRef<const Expr *> Args);
 
+  // Detects [[clang::lifetime_capture_by(X)]] annotations on a function call to
+  // create flow facts from captured arguments to the capturer
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Xazax-hun wrote:

```suggestion
  // Handles [[clang::lifetime_capture_by(X)]] annotations on a function call to
  // create flow facts from captured arguments to the capturer.
```

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