[clang] [llvm] [clang] Implement lifetime analysis for lifetime_capture_by(X) (PR #115921)

[Haojian Wu via cfe-commits]

================
@@ -1460,7 +1486,18 @@ void checkExprLifetime(Sema &SemaRef, const 
AssignedEntity &Entity,
 
   checkExprLifetimeImpl(SemaRef, /*InitEntity=*/nullptr,
                         /*ExtendingEntity=*/nullptr, LK_Assignment, &Entity,
-                        Init);
+                        /*CapEntity=*/nullptr, Init);
+}
+
+void checkCaptureByLifetime(Sema &SemaRef, const CapturingEntity &Entity,
+                            Expr *Init) {
+  if (!SemaRef.getDiagnostics().isIgnored(
+          diag::warn_dangling_reference_captured, SourceLocation()))
----------------
hokein wrote:

we should do it for `warn_dangling_reference_captured_by_unknown` as well?

https://github.com/llvm/llvm-project/pull/115921
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